help me please.
*TRUE or FALSE*
1.the north pole of a permanent magnet is attracted to a south pole
2.iron,aluminum, and nickel are all ferromagnetic materials
3.all permanent magnets are surrounded by a magnetic field
4.the direction of a magnetic field is indicated by the north pole of a compass.
5.magnets are used to amplify sound of a loudspeaker
6.magnetic field lines outside a permanent magnet originate from the north pole and end on the south pole.
7.when a permanent magnet is cut in half,one piece will be a north pole and one piece will be a south pole
8.the magnetic force on a charged particle in a magnetic field is a maximum if the particle is stationary
9.the magnitude of the magnetic force that acts on a charged particle in a magnetic field is independent of the sign of the charge
10.a charged particle is moving in a uniform,constant magnetic field.the magnetic force exerted on the particle increases the speed of the particle.
11.a proton traveling due east in a region that contains only a magnetic field experiences a vertically upward force away from the surface of the earth (the x-y plane).the direction of the magnetic field is towards north.
12.an electron traveling due north enters a region that contains a uniform magnetic field that points due east will be deflected down (onto the plane).
13.a proton is traveling south as it enters a region that contains a magnetic field.it is deflected downward toward the earth (the plane) if the direction of the magnetic field is westward.
14.an electron traveling horizontally enters a region where a uniform magnetic field is directed into the plane of the paper as shown.the motion of the electron once it has entered the field is upward and circular.
[x x x x x]
.--->
[x x x x x]
[x x x x x]
[x x x x x]
15.two electrons are located in a region of space where the magnetic field is zero. electron A is at rest; and electron B is moving westward with a constant velocity. A non-zero magnetic field directed eastward is then applied to the region. after the field is applied electron A will remain at rest while electron B will continue to move westward.
16.an electron is moving with a speed of 3.5x10^5 m/s along +x axis when it encounters a magnetic field of 0.60T. the direction of the magnetic field makes an angle of 60.0 degree with respect to the velocity of the electron, onthe same plane. the magnetic force on the electron is 2.9x10^-14 N, out of the plane.
17.a long,straight wire carries a 6.0-A current that is directed in the positive x direction. when a uniform magnetic field is applied perpendicular to a 3.0 m segment of the wire,the magnetic force on the segment is 0.36 N,directed in the negative Y direction. the magnitude and direction of the magnetic field 0.020 T, onto the plane.
18.a current-carrying, rectangular coil of wire is placed is placed in a magnetic field. the magnitude of the torque on the coil is not dependent to the direction of the current in loop.
A wire is bent into the shape of a circle of radius=0.10m and carries a 20.0A current in the direction shown.
20.0A
-->
CIRCLE
r
^ / ^
| ./ |
<--
19.the direction of the magnetic field at the center of the loop is onto the plane.
20.the magnitude of the field at the center of the loop is 1.3x10^4T.
Here are the correct answers:
1. TRUE
2. TRUE
3. TRUE
4. TRUE
5. FALSE
6. TRUE
7. FALSE
8. FALSE
9. TRUE
10. FALSE
11. TRUE
12. TRUE
13. FALSE
14. TRUE
15. FALSE
16. FALSE
17. TRUE
18. FALSE
19. TRUE
20. FALSE
To determine if each statement is true or false, let's break down each statement and analyze the concepts involved:
1. TRUE. The north pole of a permanent magnet is indeed attracted to a south pole. This is because opposite poles attract each other according to the magnetic field.
2. TRUE. Iron, aluminum, and nickel are all ferromagnetic materials. These materials have magnetic properties and can be magnetized.
3. TRUE. All permanent magnets are indeed surrounded by a magnetic field. A magnetic field is created by the movement of charged particles within or around a magnet.
4. TRUE. The direction of a magnetic field is indicated by the north pole of a compass. The north pole of a compass needle aligns with the magnetic field lines, which point from the north pole to the south pole.
5. FALSE. Magnets are not used to amplify the sound of a loudspeaker. Loudspeakers use an electric signal to create a magnetic field, which then interacts with a permanent magnet to produce sound.
6. TRUE. Magnetic field lines outside a permanent magnet do indeed originate from the north pole and end on the south pole. The field lines show the path of the magnetic field.
7. TRUE. When a permanent magnet is cut in half, one piece will become a north pole, and the other piece will become a south pole. This is because the magnetic field aligns with the material's domains.
8. FALSE. The magnetic force on a charged particle in a magnetic field is not dependent on whether the particle is stationary. It depends on the velocity and charge of the particle, as well as the strength and direction of the magnetic field.
9. TRUE. The magnitude of the magnetic force that acts on a charged particle in a magnetic field is indeed independent of the sign of the charge. The force depends on the speed, charge, and direction of motion of the particle.
10. FALSE. The magnetic force exerted on a charged particle in a magnetic field does not increase the speed of the particle. It only changes the particle's direction of motion, not its speed.
11. TRUE. A proton traveling due east in a region with only a magnetic field will experience a vertically upward force away from the surface of the Earth. The direction of the magnetic field towards the north confirms this.
12. FALSE. An electron traveling due north entering a region with a uniform magnetic field pointing due east will be deflected up (away from the plane), not down.
13. TRUE. A proton traveling south entering a region with a westward magnetic field will be deflected downward (towards the Earth).
14. TRUE. An electron traveling horizontally entering a uniform magnetic field directed into the plane of the paper will move upward and in a circular motion due to the interaction between the magnetic field and the charged particle.
15. FALSE. Electron A will remain at rest while electron B will be affected by the non-zero magnetic field and change its motion due to the interaction between the magnetic field and the moving charge.
16. TRUE. Given the information provided, the magnetic force on the electron is directed out of the plane.
17. TRUE. The magnetic force on the wire segment, given the direction and magnitude, can be used to determine the magnetic field. The magnitude of the magnetic field is 0.020 T, directed into the plane.
18. FALSE. The torque on a current-carrying rectangular coil is dependent on the direction of the current. Changing the direction of the current will lead to a change in the direction of the torque.
19. TRUE. At the center of the circular loop, the magnetic field is directed into the plane.
20. FALSE. The magnitude of the magnetic field at the center of the circular loop is not mentioned, so it cannot be determined from the given information.
Remember to always carefully analyze the concepts involved and use the relevant formulas or principles to determine the correctness of a statement.