# physics - speed of electron in magnetic field

85,328 results, page 3

### Physics

What is the difference between magnetic field of a bar magnet anf the magnetic field around a current-carrying coil? Please answer with a good explanation.

### physics

A wire 20cm long carry current of 2A is placed perpendicular to a uniform magnetic field. If a force of 0.8N acts on it. Calculate the value of the magnetic field intensity B

### physics

In any region of space where a magnetic field is changing in time, there is which of these?. A) None of these.B) induced electric field, also changing in time.C) All of these.D) even larger magnetic field.E) induced gravitational field.

### physics

In any region of space where a magnetic field is changing in time, there is which of these?. A) None of these.B) induced electric field, also changing in time.C) All of these.D) even larger magnetic field.E) induced gravitational field.

Electricity may be generated by rotating a loop of wire between the poles of a magnet. The induced current is greates when: a.Plane of loop makes an angle 45 degrees with the magnetic field b.The plane of the loop is parallel to the magnetic field c.The plane of the loop is ...

### College

An electron enters the region of a uniform electric field, with v1=3*10^6 m/s and E=200N/C. The horizontal length of the plates is 0.100m 1. Fine the acceleration of the electron while in the field. 2. If the electron enters the field at a time t=0, find the time at which it ...

### Physics

At a particular instant, a charged particle (+q) moves toward south at speed v in a uniform magnetic field that is directed toward you. The magnetic force that acts on it is

### Physics

An electron and a proton execute uniform circular motion in the presence of a uniform magnetic field. If the radius of the circle is the same for both particles, which of the following statements is true? A)Both particles move in the same direction; the electron moves faster ...

### Physics

An electron and a proton execute uniform circular motion in the presence of a uniform magnetic field. If the radius of the circle is the same for both particles, which of the following statements is true? a. Both particles move in the same direction; the electron moves faster ...

### physics

Electronic types neglect the force of gravity on electrons.To see why, compute the force of Earth's gravity on an electron and compare it with the force exerted on the electron by an electric field of magnitude 6000 V/m (a relatively small field). The mass of an electron 9....

### physics

Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 8.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 3.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the earth's...

### Physics

Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 7.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 2.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the earth's...

### physics

according to Lenz's law, the magnetic field of an induced current in a conductor will a. enhance the applied field b. heat the conductor c. increase the potential difference d. oppose a change in the applied magnetic field i think D

### Electromagnetism

A particle with a mass of 6.64x10^-27 kg and a charge of +3.2x10^-19 C is accelerated from rest through a potential difference of 2.45x10^6 V. the particle then enters a uniform magnetic field of strength 1.60 T. a) Find the particle's gain in KE as it moves through the ...

### physics

Which of the following is correct for the charge in a magnetic field? Choose one answer. a. A stationery charge can experience a force in a magnetic field. b. A moving charge parallel to the direction of the magnetic field can experience a force. c. A moving charge ...

### Physics

Physics Question Please Help? A wire, 20.0 m long, moves at 4.0 m/s perpendicularly through a magnetic field. An EMF of 40V is induced in the wire. What is strength of the magnetic field?

### physics-Electric & magnetic fields

A proton traveling at 10^4 m/s in the positive x-direction, enters a region where there is uniform electric field of magnitude 10 v/m and a uniform magnetic field of magnitude 10^-2 T. The electric and magnetic fields are parallel and are in the z-direction. In the following ...

After the velocity selector, a mass spectrometer allows the charged particle to enter a region of magnetic field only, where it follows a curved trajectory and hits a detector which records his position. Your mass spectrometer has the velocity selector set for 2.39 x 10^5 m/s ...

### physics

A proton travels at a speed of 2.0..*.10Ò meters/second. Its velocity is at right angles with a magnetic field of strength 5.5..*.10È³ tesla. What is the magnitude of the magnetic force on the proton?

### Physics

A flat circular coil with 192 turns, a radius of 2.35 x 10-2 m, and a resistance of 0.359 Ù is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ÄB/Ät = 0.696 ...

### Physics

A coil is made up of 19 square loops with the sides equal to 5.3 cm. The coil is placed in a uniform 350 mT magnetic field with the axis of the coil parallel to the magnetic field. If the field reverses direction in 0.17 seconds, what is in volts, the average emf induced in ...

### Physical science

consider a flat square coil with 10 turns. The coil is 1m wide on each side and has a magnetic field of 1,0T passing through it. The plane of the coil is perpendicular to the magnetic field: the field points out of the page. Use faraday's law to calculate the induced emf, if ...

### Physics

A magnetic field is uniform in a region of radius 10cm, and increasing at 0.02 Tesla/second. What is the magnitude of electric field in the region outside the magnetic field at radius of 15 cm?

### Physics II

A positively charged particle is moving with a velocity v in a large homogeneous magnetic field. (a) If the field is 4 mT, the mass of the particle is 33·10−9 kg, its initial speed 8.1 m/s, and its charge 6 μC, what is the magnitude of its acceleration? (in m/s^2...

After the velocity selector, a mass spectrometer allows the charged particle to enter a region of magnetic field only, where it follows a curved trajectory and hits a detector which records his position. Your mass spectrometer has the velocity selector set for 2.39 x 10^5 m/s ...

### physics

A particle of mass 7.7 × 10-8 kg and charge +11 μC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 4.2 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west. How much time does...

### PHYSICS

A particle with a mass of 2.00x10-16 kg and a charge of 22.0 nC starts from rest, is accelerated by a strong electric field, and is fired from a small source inside a region of uniform constant magnetic field 0.660 T. The velocity of the particle is perpendicular to the field...

### Physics

Suppose that the magnetic field o fthe Earth were due to a single current moving in a circle of radius 2988 km through the earth’s molten core. The strength of the Earth’s magnetic field on the surface near a magnetic pole is about 6.00E-5 T. About how large a current ...

### physics help!

An electron enters the region of a uniform electric field between two oppositely charged parallel plates as shown, with an initial velocity of 3 x 106 m/s. The electric field between the plates is measured to be E = 200N/C. The horizontal length of the plates is 10cm. a. Find ...

### Physics

1)A current-carrying conductor is kept at right angles to the direction of a magnetic field. What happens to the force acting on the wire if the strength of the magnetic field doubles? the force is doubled. 2)How much current is required to produce a force of 0.96 N on a 75 cm...

### physics

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field. Find the ratio of the radii of their circular orbits when the electron and proton have A. the same momentum B. the same kinetic energy

### SIMPLE physics!!!!!!

A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic field in Teslas so that no electric field is ...

### Physics - urgent

I already asked this and was given an answer, but I don't fully understand it and so would like a further explanation. What I asked was... An electron is accelerated through a uniform electric field of magnitude 2.5x10^2 N/C with an initial speed of 1.2x10^6 m/s parallel to ...

### physics

An electron is accelerated from rest through a potential difference that has a magnitude of 2.90 × 107 V. The mass of the electron is 9.11 × 10-31 kg, and the negative charge of the electron has a magnitude of 1.60 × 10-19 C. (a) What is the relativistic kinetic energy (in ...

### physics

consider an electron near the equator. in which direction does it tend to deflect by the magnetic field of the earth if its velocity is directed a. downward b.northward c.westward d.woutheastward

### Physics

A proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular path?

### Physics

A proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular path?

### Physics

An electron strikes the back of a TV screen at 1/10 the speed of light. What is the speed of the electron? What is the momentum of the electron? What is the deBrogile wavelength of the electron?

### Physics

A circular loop of radius 0.10m is rotating in a uniform magnetic field of 0.20T. Find magnetic flux B F through the loop and the magnetic field vector in Figure 1 a) Are parallel b) Are perpendicular c) Are at 30o (Ans: 0, 2.0x10-3Wb, 1.0x10-3Wb ) I need the working for the ...

### physics

an elecrton is placed in a uniform electric field of 232 n/c charge. if the electron is at rest at the origin of t=0 and the field is in the positive direction, what are the x and y coordinates of the electron at t=2.3 ns

### physics

A proton traveling at 10^4 m/s in the positive x-direction, enters a region where there is uniform electric field of magnitude 10 v/m and a uniform magnetic field of magnitude 10^-2 T. The electric and magnetic fields are parallel and are in the z-direction. In the following ...

### physics

A proton traveling at 10^4 m/s in the positive x-direction, enters a region where there is uniform electric field of magnitude 10 v/m and a uniform magnetic field of magnitude 10^-2 T. The electric and magnetic fields are parallel and are in the z-direction. In the following ...

### Physics

A particle of mass 6.80 10-8 kg and charge 4.4-µC is traveling due east. It enters perpendicularly a magnetic field whose magnitude is 29.0 T. After entering the field, the particle completes one-half of a circle and exits the field traveling due west. How much time does the ...

### Magnetic Field Forces: Physics

A uniform magnetic field points north; its magnitude is 3.5 T. A proton with kinetic energy 6.0 × 10-13 J is moving vertically downward in this field. What is the magnetic force acting on it? This is what I've done. The answer is incorrect. Please help me find out why. 3.5T ...

### physics

An electron is accelerated by a constant electric field of magnitude 325 N/C. (a) Find the acceleration of the electron. (m/s^2) (b) Use the equations of motion with constant acceleration to find the electron's speed after 1.05 10-8 s, assuming it starts from rest. (m/s)

### physics

What magnetic field is required to constrain an electron with a kinetic energy of 400eV to a circular path of radius .80m? (answer: 8.4x10^-5T) What equation(s) do I use? Any help is appreciated!

### Physics

A horizontal wire of length 0.48 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 19° it experiences a magnetic force of 4.00 10-3 N. ...

### physics

A horizontal wire of length 0.78 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 20°, it experiences a magnetic force of 8.3 x 10-3 N. ...

### physics

horizontal and vertical component of earth's magnetic field at a place are 0.22 tesla and 0.38 tesla respectively then find the resultant intensity of magnetic field

### physics

A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?

### Physics

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...

### Physics

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...

### Physics

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...

### Physics

A square conducting loop with sides of length L is rotation at a constant angular speed of, w (omega), in a uniform magnetic field of magnitude B. At time t=0, the loop is oriented so that the direction normal to the loop is aligned with the magnetic field. Find the expression...

### physics

A 1.6 N loop of wire is hung in a magnetic field as shown. If the spring scale reads 0.60 N when a current of 1.0 A passes through the loop what is the magnitude and direction of the magnetic field?

### physics

What is the direction of the force acting on a current-carrying conductor lying in a magnetic field? A. It is in a direction opposite to the direction of the magnetic field. B. It is at angles to the direction of the current. C. It is at right angles to both the direction of ...

### Physics

An electron moves to the left with a velocity of 3.2 x 10^5 m/s and has a magnetic force of 5.6 x 10^-17 N exerted on it. What is the magnitude of the magnitude field? Assume the charge has a value of 1.60 x 10^-19 C.

### Physics

A beam of protons is accelerated through a potential difference of 0.745 kV and then enters a uniform magnetic field traveling perpendicular to the field. (a) What magnitude of field is needed to bend these protons in a circular arc of diameter 1.75 m? (b) What magnetic field ...

### physics

an electron moves with constant speed at right angles to a uniform magnetic flux, if the flux density were doubled, the force on the electron would be A) unaffected B) reduced to one month C) halved D) doubled E) quadrupled

### physics

A flat circular coil with 113 turns, a radius of 3.64 10-2 m, and a resistance of 0.524 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/Δ...

### Physics

A flat circular coil with 193 turns, a radius of 5.50 x 10-2 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/&#...

### Physics

A uniform electric field of magnitude 370 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 2.70 cm. (a) What is the work done by the field on the electron? J? (b) What is the change in potential energy associated ...

### physics

A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?

### physics

A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?

### physics

3. What is the magnitude of the electric field strength E such that an electron, when placed in the field, would experience an electrical force equal to its weight? What electric field strength E is required if the electron is replaced by a proton

### physics

The Bohr model of the hydrogen atom consists of an electron travelling in a circular orbit of radius 5.29 x 10-11 m around a proton. The attraction between the two gives the electron the centripetal force required to stay in orbit. Calculate the: a. Electric force between the ...

### Physics

A proton, moving in negative y-direction in a magnetic field , experiences a force of magnitude F, acting in the negative x direction. a) What is the direction of the magnetic field producing force? b) Does your answer change if the word proton is replaced by electron? I get a...

A flat circular coil with 97 turns, a radius of 4.04 10-2 m, and a resistance of 0.528 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of ΔB/Δt...

### PHYSICS

AN ELECTRIC FIELD 1500N AND MAGNETIC FIELD 0.40T ACT AT A,MOVING PROTRON TO PRODUCE NO FORCE.CALCULATE THE MINIMUM SPEED OF THE PROTRON.

### physics 30

A charged particle with mass m, and a charge q, is moving through a perpendicular magnetic field of strength B at a velocity,v. The particle is deflected through a curved path with a radius of 15.0 cm. If the speed of the same particle is doubled and the magnetic field is ...

### Physics

What must be known to determine the direction of the magnetic force on a charge? the type of the charge the amount of the charge the direction of the magnetic field the velocity of the charge the strength of the magnetic field

### Physics

An electron has a kinetic energy of 7.00 10-17 J. It moves on a circular path that is perpendicular to a uniform magnetic field of magnitude 4.40 10-5 T. Determine the radius of the path?

### physics

an electron with velocity v=3x10 to the power 7 m/s describes a circular path in a uniform magnetic field of 0.2T perpendicular to it calculate the radius of the path?

### physics

A conductor of length 0.8 m carrying a current of 2.5 A is kept in a magnetic field of 0.6 Tesla. What is the magnitude of the force experienced by the conductor if it is inclined at an angle 30° to the direction of the magnetic field? Choose one answer. a. 0.6 N b. 1.0 N c. ...

### Physics

A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 15.1 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the ends of the wire and ...

### physics

At a certain location on the Earth, the horizontal component of the Earth’s magnetic field is 2.5 ·10−5 T due North. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight so the net force on the proton will be zero. Find ...

### Physics

A uniform electric field of magnitude 410 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.00 cm. (a) What is the work done by the field on the electron?(b) What is the change in potential energy associated with...

### physics

the magnitude of earths magnetic field at the magnetic north pole is 61/1000000.(a) determine the magnitude of the dipole moment of the earth (b)suppose an additional field due to the current in wire around the equator is used to make the net field at the pole zero,what is the...

### Physics

3. A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region of magnetic field...

### physics

A uniform magnetic field makes an angle of 30 degrees with the axis of a circular loop of 300 turns and radius of 4 cm. The magnetic field changes at a rate of 85 T/s. Determine the magnitude of the induced emf in the loop.

### Physics

Am i correct? My work 0.10/0.20= .5 = 1/2 or is it the other way around? .20/.10? Suppose a magnetic field of 0.20 T is applied to the area within a circular loop of wire. The strength of the field is then changed to 0.10 T. By what factor is the magnetic flux changed? A. 2 B...

### Physics

Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 ~ 10−3 ƒ¶ is in a region where there is a uniform magnetic field B. The field is at 30‹ to the normal to the plane of the wire loop as shown in Figure 3. The magnitude...

### physics

A moving rod is 12.0 cm long and moves with a speed of 15.0 cm/s. If the magnetic field is 0.800 T, calculate (a) the emf developed, and (b) the electric field in the rod. I got a)0.0132v and b).12v/m

### Physics

The figure below shows two current carrying wires and the directions of the currents they carry. The wires carry the following currents: I1 = 7.1 A and I2 = 8.9 A. Wire 1 is at (0, 5.8) mm; wire 2 is at (15.1, 0) mm; point P is at (15.1, 5.8) mm. Wire 1 is pointing into the ...

### Physics

A circular loop of wire with radius 0.0450 m and resistance 0.154 R is in a region of spatially uniform magnetic. The magnetic field is directed out of the plane. The magnetic field has an initial value of 7.89 T and is decreasing at a rate of -0.630 T/s. What is the rate at ...

Please let me know if my answers are not correct/not thorough enough. 1) Q:What happens when the number of loops in the armature of a generator is increased? 1) A:More loops= more voltage _________________________ 2) Q: Why does a piece of iron behave like a temporary magnet ...

### Physics

A proton accelerates through a particle accelerator, with a final speed of 8.0 x 10^6 m/s. It experiences a magnetic field of 3.0T that is produced by steering magnets inside the accelerator. What is the number of the magnetic force pulling on the proton?

An electron is placed in a vertical electric field directed upward and of intensity E=5v/m. Compare the weight of the electron to the electrostatic force to which it is submitted. Deduce. Gravitational field strength: g=9.8m/s^2 Thanks.

### physics

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...

### Physics help

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...

### physics

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...

### physics

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of the ...

### help help physics

An electron enters the region of a uniform electric field between two oppositely charged parallel plates as shown, with an initial velocity of 3 x 106 m/s. The electric field between the plates is measured to be E = 200N/C. The horizontal length of the plates is 10cm. a. Find ...

### physics

An electron enters the region of a uniform electric field between two oppositely charged parallel plates as shown, with an initial velocity of 3 x 106 m/s. The electric field between the plates is measured to be E = 200N/C. The horizontal length of the plates is 10cm. a. Find ...

### Physics

A rapidly changing magnetic field in any region of space induces a rapidly changing A.Magnetic field or B.Electric field? which in turn induces a rapidly changing A.Magnetic field B.Electric field?

### college

Two copper rings are dropped from a region where no magnetic field exists into a region where a strong magnetic field exists. The rings are identical except for a break in one of them. What can happen to the rings' motion as they fall through the magnetic field?

### physics-can anyone solve this please

3. A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region of magnetic field...

### Physics

A long, straight wire carrying a current of 317 A is placed in a uniform magnetic field that has a magnitude of 7.69 × 10-3 T. The wire is perpendicular to the field. Find a point in space where the net magnetic field is zero. Locate this point by specifying its perpendicular...

### Physics

Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3. The magnitude of...

### Physics

Would someone check this please? A circular loop of wire of radius 0.10 m and of resistance 2.0 x 10^−3 ohms is in a region where there is a uniform magnetic field B. The field is at 30deg to the normal to the plane of the wire loop as shown in Figure 3. The magnitude of...