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  1. There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

  2. A.
    14,400 At/Wb
    B.
    1,440 At/Wb
    C.
    9,000 At/Wb
    D.
    90,000 At/Wb

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  3. A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

  4. A.
    90
    B.
    180
    C.
    270
    D.
    360

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  5. What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

  6. A.
    6,000 T
    B.
    600 T
    C.
    600 T
    D.
    6 T

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  7. The unit for permeability is

  8. A.
    Wb/At × m
    B.
    At/m
    C.
    At/Wb
    D.
    Wb

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  9. What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

  10. A.
    18.75 At
    B.
    30 At
    C.
    300 At
    D.
    187 At

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  11. The direction of a magnetic field within a magnet is

  12. A.
    from south to north
    B.
    from north to south
    C.
    back to front
    D.
    front to back

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  13. When the north poles of two bar magnets are brought close together, there will be

  14. A.
    no force
    B.
    a downward force
    C.
    a force of attraction
    D.
    a force of repulsion

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  15. The ability of a material to remain magnetized after removal of the magnetizing force is known as

  16. A.
    permeability
    B.
    reluctance
    C.
    hysteresis
    D.
    retentivity

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  17. The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is

  18. A.
    1.7 mA
    B.
    16 mA
    C.
    12 mA
    D.
    120 mA

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  19. The induced voltage across a stationary conductor in a stationary magnetic field is

  20. A.
    zero
    B.
    reversed in polarity
    C.
    increased
    D.
    decreased

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