1. How does increasing the electric current affect the strength of an electromagnet? 2. What three ways are electromagnets different than magnets? 3. Explain the relationship between the number of loops in an electromagnet and the strength of the magnet.

19,093 results
  1. Science

    Which statement explains how the charges on objects determine the electric force between them? (1 point) Objects with positive charges repel each other, and objects with negative charges attract each other. Objects with the same charge repel each other,

  2. Science

    An electromagnet is the most powerful type of magnet there is . It is a magnet with a current running through it that can be turned on and off , Why might it be useful to be able to turn the electromagnet on and off ? To control the strength of the magnet

  3. science PLZ HELP

    electric charges that are different A) attract each other B) repel each other C) exist in pairs D) do not interact Magnetic field lines around a bar magnet A) are only perpendicular to the magnet B) spread out from one pole and curve around the other C)

  4. science

    Which circuit will have the greatest electric current? (1 point) circuit 1 circuit 4 circuit 2 circuit 3 Circuit A has a resistance of 7.5 ohms, and circuit B has a resistance of 5 ohms. Which statement about the circuits must be correct?(1 point) If the

  5. science

    An advantage of using an electromagnet, shown on the crane in the image below, instead of a regular magnet to move cars in a junkyard is that an electromagnet can easily be turned on and off.

  6. Physics / ICP

    1. The strength of an electromagnet depends on several factors, including the number of coils wrapped around the core of the electromagnet and the voltage of the power source. The greater the number of coils, the stronger the electromagnet. And, the

  7. science

    Use the table of information about four electromagnets to answer the question. Electromagnet Current Intensity Number of Turns in the Wire W medium 10 X low 10 Y medium 50 Z low 50 Which electromagnet will produce the strongest magnetic force? (1 point)

  8. Physics (electromagnets)

    2. How might the following things affect the strength of the electromagnet (nail and coil and battery)? ◦ Thickness of the core. ◦ The amount of current going through the wire. ◦ How many times the wire is wrapped around the core I'm not sure.

  9. physics

    please check this: Which sentence best describes electrical conductors? a. electrical conductors have low mass density b. electrical conductors have high tensile strength c. electrical conductors have electric charges that move freely d. electrical

  10. Science

    CHECK MY ANSWERS!!! Strength of Magnetic Forces 1) Which electromagnet will produce the strongest magnetic force? A) Electromagnet Y 2) A student connects a battery to a wire and wraps the wire around an iron nail to produce an electromagnet. Which action

  11. physics

    check which of the following modifications to a solenoid would be most likely to decrease the strength of its magnetic field? a. removing its iron rod core and increasing the number of coils b. increasing the current and reducing the number of coils c.

  12. Science Help Please

    A) Which statement explains how the charges on objects determine the electric force between them? (1 point) Objects with positive charges repel each other, and objects with negative charges attract each other. Objects with the same charge repel each other,

  13. science

    An electromagnet is a coil of wire with a current running through it. This creates an electromagnetic field. An additional magnet and its poles interact with the electromagnet, causing an electromagnetic motor to turn. What are some ways you could make an

  14. Science

    An electromagnet is ____. A. a permanent magnet B. made with bar magnets C. able to attract all metal substances D. only operating when the current is on I think it is D..?

  15. Science 8th Grade

    Items of clothing rub against each other when they are in a clothes dryer. This can sometimes cause a person to feel a slight shock when he or she removes the clothes from the dryer. This is due to A. The dryer not being grounded B. Static Electricity ****

  16. Science

    What is the relationship between number of loops on an electromagnet and the strength of the magnet? Can you help e or break this down for me please? @Ms.Sue thank you

  17. Physics Flux

    The electric flux through the surface shown in Figure Ex27.10 is 15.0 Nm2/C, and the electric field makes an angle á = 70° with the surface. What is the electric field strength? The surface is a 10cm by 10cm square.

  18. science

    What could Eric have changed in his electromagnet that caused the decrease in magnetic force from point A to point B? (You MUST give at least 3 possible reasons/changes in the electromagnet)

  19. Physical Science

    ok so i keep getting one wrong on a 4 question test and failing so can someone tell me what im getting wrong 1. What causes an electric current in a wire? A. Electric fields cause atoms to move in the wire. B. Electrons flow because of electrical

  20. Physical Science

    Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil

  21. Physics

    Which factors affect the electrical force between two objects? mass and distance between them charge and distance between them mass and electric field strength charge and mass

  22. Physics

    What would be the torque on the electric motor if the current through the rectangular coil is 5A, the magnetic field strength is 0.5T, the length of the coil is 8cm and the width is 4cm?

  23. math/physics

    An electron moving through an electric field experiences an acceleration of 6.1 multiplied by 103 m/s2. (a) Find the electric force acting on the electron. (b) What is the strength of the electric field?

  24. PHYSICS

    The electron gun in a television tube uses a uniform electric field to accelerate electrons from rest to 5.0×107 m/s in a distance of 1.2 cm. What is the electric field strength?

  25. physics

    A 0.0150-m wire oriented horizontally between the poles of an electromagnet carries a direct current of 9.5 A. The angle between the direction of the current and that of the magnetic field is 25.0° as shown. If the magnetic field strength is 0.845 T, what

  26. science

    An electromagnet is a coil of wire with a current running through it. This creates an electromagnetic field. An additional magnet and its poles interact with the electromagnet, causing an electromagnetic motor to turn. What are some ways you could make an

  27. Science

    Changing the current changes the ___ of an electromagnet. Choices are: A. strength B. direction C. charge D. both a and b

  28. Physics

    1)The polarity of an electromagnet can be determined using the second right-hand rule. true. 2)Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor. false.

  29. physics

    1. Suppose that the strength of the electric field about an isolated point charge has a certain value at a distance of 1 m. How will the electric field strength compare at a distance of 2 m from the point charge? I know it's At twice the distance the field

  30. Physics - Electrons (Inside the atom)

    A beam of electrons is directed into uniform electric and magnetic feilds that are at right angles to one another and to the beam direction. The strength of the magnetic feild is 55 mT; the electric feild strength is adjusted to 600 kV m^-1 when the beam

  31. physics

    Does increasing the force affect the amount of work done climbing the stairs? Does increasing the distance affect the amount of work done climbing the stairs? How would you describe the mathematical relationship between these two parameters

  32. Physics

    The polarity of an electromagnet can be determined using the second right-hand rule. A. True B. False Is it B? Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor.

  33. SCIENCE

    1. How does increasing the electric current affect the strength of an electromagnet? 2. What three ways are electromagnets different than magnets? 3. Explain the relationship between the number of loops in an electromagnet and the strength of the magnet.

  34. PHYSICS URGENT

    2. A point charge of +1.0 µC is moved in the direction of an electric field, and it has a change in electric potential difference energy of 10.0 J. What was the change in electric potential difference? 1 µC = 10-6 C (Points : 1) -1.0 × 10^8 V -1.0 ×

  35. Science 7B

    An electromagnet is the most powerful type of magnet there is. It is a magnet with a current running through it that can be turned on and off. Why might it be useful to be able to turn the electromagnet on and off?(1 point) to latch onto and let go of

  36. Math

    Amperes (abbreviated amp) measure the strength of electric current. An ohm is the unit of electrical resistance. In an electric circuit, the current varies inversely as the resistance. If the current is 24 amps when the resistance is 20 ohms, find the

  37. Science

    What is the main difference between mechanical and electromagnet waves? a)Mechanical waves involve transfer of energy; electromagnet waves do not. b)Mechanical waves require a medium to travel in; electromagnet waves do not. c)Mechanical waves have

  38. Physics

    (a) In the LC circuit shown in the figure, the current is in the direction shown and the charges on the capacitor have the signs shown. At this time, a) the current is increasing and the charge on the positive plate is increasing. b) the current is

  39. physics

    Electric current is a flow of electric charge that moves due to an electric pressure is called what?. A) wattage.B) voltage.C) All of these to some degree.D) None of these.E) amperage. I chose ampere, this is what my textbook tells me and I got it wrong

  40. science

    If the number of loops on an electromagnet increases, the strength of the magnet will?

  41. Physics help

    1. if the magnetic field is 2.1 m from a current carrying wire is 7.1x10^-5 T, what is the current flowing through the wire? 2. The electromagnet in an MRI has a magnetic field of 2.5 T. If there are 100 A of current running through the magnet, how many

  42. physical science

    An electric current heats a 225 g copper wire from 20.0 °C to 40.0 °C. How much heat was generated by the electric current? (ccopper = 0.093 cal/gm-deg)

  43. Physics

    An electrostastic force of 20.0 newtons is exerted on a charge of 8.00 x 10^/2 C at point P in an electric field. The magnitude of the electric field strength at P is Given: Fe = 20 B q = 8.00 x 10^/2 C

  44. Science- Help quickly!

    An electromagnet is different from a permanent magnet because an electromagnet ________. is magnetic can push and pull can attract some metals can turn on and off Resistance to electricity is measured in ______. watts amps volts ohms . An electromagnet

  45. physical science

    An electric current heats a 225 g copper wire from 20.0 °C to 40.0 °C. How much heat was generated by the electric current? (ccopper = 0.093 cal/gm-deg)

  46. science

    an advantage of using an electromagnet shown on the crane the image below instead of a regular magnet to move cars in a junk yard is that an electromagnet can easily be turned on and of

  47. physcial science

    Does a light bulb glow because.... a) there is burning inside b) an electric current glows c) the filament is hot d) a very small current is flowing Wouldn't you think it was because the filament was hot? Of course, a very small current also CAN make a

  48. physics

    How are electric potential and electric field strength related?

  49. physics

    1. What did Newton conclude about the force that pulls apples to the ground and the force that holds the moon in orbit? 2. What does the very small value of the gravitational constant G (in standard units) tell us about the strength of gravitational

  50. SCIENCE

    1. How does increasing the electric current affect the strength of an electromagnet? 2. What three ways are electromagnets different than magnets?

  51. Bio

    An electromagnet can be made by wrapping insulated wire around an iron nail and connecting the ends of the wire to a 6-volt battery. HYPOTHESIS: Increasing the number of coils of wire wrapped around the nail increases the strength of the electromagnet, as

  52. science

    i need helping answering this homework question on magnetism: which of the following will induce a current in a nearby circuit? A. any magnetic field B. an electromagnet with varying current C. an unchanging electromagnet D. a powerful, unmoving horseshoe

  53. Science--Myanswer Plz, plz

    Electric charges that are different attract each other. repel each other. **** exist in pairs. do not interact. Magnetic field lines around a bar magnet are only perpendicular to the magnet. spread out from one pole and curve around to the other. ****

  54. physics

    A strong electromagnet produces a uniform field of 1.31 T over a cross-sectional area of 0.195 m2. A coil having 245 turns with a total resistance of 16 is placed around the electro- magnet, and the current in the electromagnet is turned off, reaching zero

  55. Physics

    An electromagnet has a steel core (κM≈ 2500) with an approximately circular cross sectional area of 7.0 cm2. The radius of the magnet is 12.0 cm; there is a small air gap of only 2.2 mm (see sketch). The current through the magnet's N= 120-turn coil is

  56. Science

    i have to do this packet about magnetism, but we havent even learned anything about it yet. I have got some of the answers but i cant figure out the rest. What do you need to make an electromagnet? What is an advantage of using an electromagnet? Name 3

  57. Science

    My question is, What was the function of a capacitor in an electric current? Could someone please help me I ruled out one of my theorys already and that was to increase circuit power. Was it to allow current flow between its plates? Was it to measure the

  58. Physics

    1. You are looking into a current carrying solenoid and notice that the compass needle indicates that you are at the south end of the magnetic field. What is the direction of the current in the coil and how do you know? Would it be clockwise because

  59. Physics

    An electric dipole is formed from two charges, ±q, spaced 1.00cm apart. The dipole is at the origin, oriented along the y-axis. The electric field strength at the point (x,y)=(0cm,10cm) is 320N/C . What is the charge q? Give your answer in nC. What is the

  60. electricity

    the function of a capacitor in an electric circuit is to? A)allow current flow between its plates. B)measure the amount of current in the circuit. C)increase circuit power. D) store electric charges. A and D are both correct, if you include in "current

  61. Science

    Please chrck my answer! How does a galvanometer use a magnetic field to indicate the strength of an electric current? When a current is passed through a magnetic field, it goes through a coil and to a galvanometer.

  62. Science/Astronomy

    Large geomagnetic storms can cause surges of electric current here on Earth. What is the MOST LIKELY result of a large surge in electric current? F. power outages G.better TV reception H. cheaper electric power I. Local Group galaxy What is the answer???

  63. physics

    Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called dielectric strength. The

  64. Physics

    I don't know how to approach this question... Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric

  65. 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

  66. Physics

    Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called dielectric strength. The

  67. Physics

    A charge of 1nC is added to a spherical soap bubble with a radius of 3.0cm. What is the electric field strength just outside of the bubble? What is the electric field strength just inside of the bubble? The field experienced by each charge in the skin of

  68. physics

    Using the circuit for an electric bell, a) Explain why the bell won't work if the elctromagnet is replaced with a permanent magnet. (2 marks) b)Explain why the core of the electromagnet used in an electric bell must not be made from steel. (3 marks)

  69. physics

    Using the circuit for an electric bell, a) Explain why the bell won't work if the elctromagnet is replaced with a permanent magnet. (2 marks) b)Explain why the core of the electromagnet used in an electric bell must not be made from steel. (3 marks)

  70. physics

    The electric field strength 6.0 cm from a very long charged wire is 1700 N/C. What is the electric field strength 10.0 cm from the wire?

  71. science please!

    1. Why is the electric potential midway between a dipole equal to zero? 2. How can you identify an equation as being that of a fractal? 3. How does a current carrying wire on top of a magnetized compass needle affect its direction? THANKS

  72. Electromagnetism

    **define any of the following** 1.magnet 2.poles 3.magnetic force 4.electromagnetism 5.solenoid 6.electromagnet 7.electric motor 8.electromagnetic induction 9.generator 10.transformer

  73. Physics

    What is the difference between electric force, electric potential energy, electric field strength, electric potential, and electric potential difference?

  74. Physics

    Why is electric force more than electric field strength?

  75. Physics

    Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). a) What is the electric current density associated with the flow of these ions? b) What is the electric current in the pipe?

  76. Physics

    Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? What is the electric current in the pipe?

  77. chem webwork

    A. Increasing halogen atom size. B. Decreasing acid strength. C. Shortening of the C-C bond. D. Increasing electronegativity. E. Higher dipole values going from F to Cl to Br. cant paste the spartan stuff... whats the answer?!?!?

  78. Physics

    I know this is so simple but for some reason I am having a brain fart... A 20 C charge experiences a 2 N force in an electric field. What is the strength of the electric field? Please help and laugh later thank you lol

  79. Physic

    Determine, (at a point 10.0cm from a point charge of 100x10^-6C) a. The electric potential b. Electric field strength

  80. Physics

    The electric flux through the surface shown in Figure Ex27.10 is 15.0 Nm2/C, and the electric field makes an angle α = 70° with the surface. What is the electric field strength? The surface is a 10cm by 10cm square.

  81. Science

    An electromagnet in a galvanometer A. Increases the voltage in a circuit B. moves a pointer along a numbered scale in response to a current. C. induces an electric current. D. increases the current in a circuit. I got A, but apparently that is wrong....a

  82. Physics

    An electromagnet has a steel core (κM≈ 2500) with an approximately circular cross sectional area of 8.0 cm2. The radius of the magnet is 7.0 cm; there is a small air gap of only 3.2 mm (see sketch). The current through the magnet's N= 100-turn coil is

  83. phsics multiple choice

    1)A coil of length 1cm has N turns and carries an electric current I. It creates at a point M a magnetic field of intensity B. -If a current 3I is sent in the coil the field strength at M becomes: a. 3B b. B/3 c. B -If the number of turns per unit length

  84. physics multiple choice

    1)A coil of length 1cm has N turns and carries an electric current I. It creates at a point M a magnetic field of intensity B. -If a current 3I is sent in the coil the field strength at M becomes: a. 3B b. B/3 c. B -If the number of turns per unit length

  85. Physics check ASAP

    1. Copper is wrapped with rubber when used in electric wiring. What describes rubber as a material? A. Electromagnet B. Superconductor C. Conductor D. Insulator 2. Which material provides resistance to the flow of electrons? A. Saltwater B. Salt Crystals

  86. Physics

    The electric field strength at a particular distance from an electric charge is 2.0 N/C. What is the electric field strength if you are 2 times closer to the same charge?

  87. Physics

    Power transmission lines often use a form of electric current called alternating current, but in many regions, such as the Province of Quebec, high-voltage direct-current lines are used instead. Direct current is the kind of electric current you are

  88. Physics

    Need help matching the numbers to a - f. I need some explanations to understand. 4. The water enters the pump at a low pressure and the pump does work on the water to eject it at high pressure and with more energy. 5. The water pump provides the motive

  89. physics

    Need help matching the numbers to a - f. 4. The water enters the pump at a low pressure and the pump does work on the water to eject it at high pressure and with more energy. 5. The water pump provides the motive force that pushes water through the pipes.

  90. Science

    18. What is the difference between nearsightedness and farsightedness? ((Is that just for regular sight, or is there another term I'm not recognizing?)) ((LINKS FOR ALL THE QUESTIONS BELOW, PLEASE!)) 19. Describe how an electromagnet works and give an

  91. Physical Science

    a vacum tube can be used to change alternating current into direct current increase the strength of a signal turn a current on or off all of the above

  92. Science

    What happens when the voltage in an electric circuit goes up? The force in the electric current goes down. The charge of the electric current goes up. The number of volts goes down. The number of electrons in the circuit goes up.

  93. calculus

    The voltage in a electric current is 100 volts then with Ohm's law how do you find the instantaneous rate of change of I with respect to R ta a resistance of 20 ohms if R is increasing I know how to use the instantaneous formula but what is f(a)

  94. Physics

    The electric field strength @ distance = 1.0 m from a point charge is 4.0 x 10^4 N/C. What is the Electric field strength @ 2.0 m from the same charge?

  95. Physics/Eletrical engineering

    Which of the following is a conducting loop in which electrons carrying electric energy may be transferred from a suitable source to do a useful work and returned to the source? a.) Direct current b.) Indirect current c.) Electric circuit d.) source of

  96. 11th grade physics

    Two point charges q and q' are placed respectively at two points A and B. Let O be the midpoint of [AB]. Charge q placed at A creates at O an electric field of strength E=9×10^6 V/m. Determine the resultant electric field at O when: a) q'=q b) q'=-q

  97. 11th grade physics

    Two point charges q and q' are placed respectively at two points A and B. Let O be the midpoint of [AB]. Charge q placed at A creates at O an electric field of strength E=9×10^6 V/m. Determine the resultant electric field at O when: a) q'=q b) q'=-q

  98. 11th grade physics

    Two point charges q and q' are placed respectively at two points A and B. Let O be the midpoint of [AB]. Charge q placed at A creates at O an electric field of strength E=9×10^6 V/m. Determine the resultant electric field at O when: a) q'=q b) q'=-q

  99. Physics

    suppose you want to design a capacitor that uses mica as the dielectric material which has K = 7 and a dielectric strength of 150 MV/m. It is intended to store at least 1.- J of energy and be able to withstand a voltage up to 250 volts without electric

  100. Physics

    suppose you want to design a capacitor that uses mica as the dielectric material which has K = 7 and a dielectric strength of 150 MV/m. It is intended to store at least 1.- J of energy and be able to withstand a voltage up to 250 volts without electric

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