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Magnetism and Electromagnetism - General Questions
Magnetism and Electromagnetism - True or False

  1. An electromagnetic field exists only when there is

    2. A.
    an increasing current
    B.
    decreasing current
    C.
    voltage
    D.
    current

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  2. When a solenoid is activated, the force that moves the plunger is

    3. A.
    an electromagnetic field
    B.
    a permanent magnetic field
    C.
    varying voltage
    D.
    a steady current

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  3. What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

    4. A.
    2,400 At
    B.
    240 At
    C.
    24 At
    D.
    2.4 At

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  4. If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

    5. A.
    remains unchanged
    B.
    reverses polarity
    C.
    increases
    D.
    decreases

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