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78 True/False questions

  1. numberA generator produces changing____, because of its constant rotating

          

  2. energyUse the ___ right hand rule to figure out the direction of current flow in the wire

          

  3. Electromagnetic RadiationMaxwell predicted that light was ___-

          

  4. perpendicularOnly the portion of the magnetic field____ to the wire will induce current in it

          

  5. Lenz's lawYou can use ____ to find resistance

          

  6. James Clerk Maxwell____created a set of equations that explain the relationship between electric and magnetic fields

          

  7. charged particularInduced current is greatest if the wire and magnetic field are_____ to each other

          

  8. -speed of wire or magnetic field motion
    -length of wire in the field
    -strength of magnetic field
    three ways to induce current

          

  9. wave-particle duality of lightElectromagnetic force obeys the ____ - as the two objects move further apart the force between them weakens

          

  10. magnetic fieldIf the applied field changes, the _____ helps to keep it constant

          

  11. 12VCar batteries provide a constant DC emf of ___

          

  12. back emfwhen the armature is perpendicular to the magnetic field in a generator, you get____

          

  13. induced fieldElectric and magnetic forces are aspects of a ____ - called electromagnetic force

          

  14. AC can be converted to DCadd rings (slip rings) and brushes to the end of the loops, the moving rings counter the changing current and create direct current for a circuit

          

  15. 230 000VUse the ___ right hand rule to figure out the direction of current flow in the wire

          

  16. equation for multiple loopsN∆ϕM/∆t

          

  17. transformer equation∆V2/∆V1 = N2/N1

          

  18. Mis the mutual inductance of the two-coil system

          

  19. reduceUse the ___ right hand rule to figure out the direction of current flow in the wire

          

  20. particlesLow-energy photons behave more like ___

          

  21. electromagnetic in natureMaxwell predicted that light was ___-

          

  22. M__ depends on the shape of the coils and how they are orientated to each other

          

  23. Step-up transformer_____ are only 90-99% efficient - power is lost due to small currents induced by changing magnetic field and resistance in the wires

          

  24. Real transformers_____ are only 90-99% efficient - power is lost due to small currents induced by changing magnetic field and resistance in the wires

          

  25. electronsThe magnetic field force pushes the___ through the wire

          

  26. emf from one loopWhen you have multiple loops, you multiple the number of loops (N) by the ____

          

  27. orientationThe magnetic field force pushes the___ through the wire

          

  28. emfA generator produces changing____, because of its constant rotating

          

  29. emf for generator (maximum)emf = NAβω

          

  30. decreaseThe magnetic field force pushes the___ through the wire

          

  31. -rotate a wire
    -drag a wire through magnetic field
    -move a magnetic field across a wire
    three ways to induce current

          

  32. increaseAn decrease in emf means an____ in current

          

  33. Michael FaradayElectric and magnetic forces are aspects of a ____ - called electromagnetic force

          

  34. transverse waveselectromagnetic waves are ___

          

  35. The Ignition coilThe current induced in the wire by moving through a magnetic field will generate its own _______

          

  36. lens law"The magnetic field of an induced current is in a direction to produce a field that oppose the change causing it"

          

  37. bar magnetThe induced magnetic field is similar to a _____- and creates a force that repels the original magnetic field

          

  38. single forceElectric and magnetic forces are aspects of a ____ - called electromagnetic force

          

  39. rightOscillating Electric and Magnetic waves - at___ angles to each other

          

  40. accelerating chargesAll EM waves are produced by ____ - a charge moves up/down through the wave at a certain frequency

          

  41. Ohm's LawYou can use ____ to find resistance

          

  42. parallelif the angle is zero the wire is____ to the magnetic field

          

  43. volt (V)emf unit is the

          

  44. photonA particle of light is called a____ - carries energy, but has no mass

          

  45. permanent magnetCurrent is supplied to loops and that magnetic field repels ______ and causes the loops to rotate

          

  46. transformersA device that increases or decreases the emf of alternating current

          

  47. Step-down transformerdecreases the emf, N2is less than N1

          

  48. emf & currentEffective ___ and effective ____ are the average values in the AC circuit - called Irms

          

  49. wavesAs the coil moves out of the magnetic field the induced field is in the_____ direction as the original and they attract each other

          

  50. wire&wireBecause AC current changes direction, the____ and____ in an AC circuit is not constant

          

  51. emf & currentAs the loop rotates from one arm being up to the other being up, the current flow will change direction - producing ____

          

  52. inverse square lawElectromagnetic force obeys the ____ - as the two objects move further apart the force between them weakens

          

  53. Mutual inductanceAs the loop rotates from one arm being up to the other being up, the current flow will change direction - producing ____

          

  54. Mutual inductance____ is the ability of one circuit to induce emf in a nearby circuit in the presence of a changing magnetic field

          

  55. sameLow-energy photons behave more like ___

          

  56. Heinrich Hertz___performed experiments that generated and detected EM waves and confirmed Maxwell's predictions.

          

  57. first coil called primarycurrent in this coil magnetizes the iron core

          

  58. 0 emfwhen the armature is perpendicular to the magnetic field in a generator, you get____

          

  59. Second coil called secondarycurrent runs through the 2nd coil because it is wrapped around magnetized iron

          

  60. 3rdUse the ___ right hand rule to figure out the direction of current flow in the wire

          

  61. mechanical energywho first demonstrated the principle of electromagnetic induction

          

  62. ωis the angular speed of rotation of the loop (2πf)

          

  63. perpendicularSome high energy EM waves will behave like____

          

  64. motorA particle of light is called a____ - carries energy, but has no mass

          

  65. oppositeA particle of light is called a____ - carries energy, but has no mass

          

  66. particlesHigh-energy photons behave more like____

          

  67. size & rotatingChanging the ___ of the loops of wire or _____ the loop in the magnetic field will change the amount of induced current

          

  68. CHANGEThe induced field does not oppose applied field, but the____ in the applied field

          

  69. maximum emfwhen the armature is parallel to the magnetic field in a generator, you get ____

          

  70. emfis the mutual inductance of the two-coil system

          

  71. potential differenceThe _____ supplied to the motor equals the applied emf minus the back emf, this also reduces current

          

  72. Equation for single loopemf = -∆ϕM/∆t

          

  73. AC currentOscillating Electric and Magnetic waves - at___ angles to each other

          

  74. Back emfwhen the armature is perpendicular to the magnetic field in a generator, you get____

          

  75. frequencyAs a motor turns more quickly, the net emf and net current in the coil___

          

  76. electromagnetic wavesEnergy transported by EM waves is called ____

          

  77. Electromagnetic inductionproducing current in a wire by placing it in a changing magnetic field

          

  78. Faraday's Law of Induction∆V2/∆V1 = N2/N1