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MAGNETISM AND ELECTROMAGNETISM

Magnetism and Electromagnetism
An electromagnetic field exists only when there is

current
voltage
an increasing current
decreasing current

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Magnetism and Electromagnetism
When a solenoid is activated, the force that moves the plunger is

an electromagnetic field
a permanent magnetic field
varying voltage
a steady current

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Magnetism and Electromagnetism
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

2,400 At
24 At
240 At
2.4 At

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

increases
remains unchanged
reverses polarity
decreases

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Magnetism and Electromagnetism
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

decreases
increases
reaches zero
remains constant

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