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5/31 MCQs for:

Electromagnetism

According to Lenz's law, the direction of an induced current in a conductor will be that which tends to produce which of the following effects?

Produce the greatest voltage.

Enhance the effect which produces it.

Produce a greater heating effect.

Oppose the effect which produces it.

Faraday's law of induction states that the emf induced in a loop of wire is proportional to:

Current divided by time.

The magnetic flux.

The magnetic flux density times the loop's area.

The time variation of the magnetic flux.

A resistor and an inductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reach:

37% of the maximum current.

75% of the maximum current.

63% of the maximum current.

25% of the maximum current.

An electric generator transforms:

Electrical energy into mechanical energy.

Direct current into alternating current.

Alternating current into direct current.

Mechanical energy into electrical energy.

A resistor and an inductor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the resistor is:

Less than the battery's terminal voltage, but not zero.

Equal to the battery's terminal voltage.

Greater than the battery's terminal voltage.

Zero.