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5/31 MCQs for:

Electromagnetism

As a coil is removed from a magnetic field an emf is induced in the coil causing a current to flow within the coil. This current interacts with the magnetic field producing a force which:

Acts in the direction of the coil's motion.

Acts at right angles to the coil's motion.

Acts in the direction opposite to the coil's motion.

Causes the coil to tend to flip over.

A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of 0.40 T. The magnetic field changes from 0.40 T in the x-direction to 0.40 T in the negative x-direction in 2.0 s. If the resistance of the coil is 16 W, at what rate is power generated in the coil?

15 W.

5.0 W.

20 W.

10 W

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:

Zero.

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

Greater than the battery's terminal voltage.

Equal to the battery's terminal voltage.

A resistor is connected to an AC power supply. On this circuit, the current:

Lags the voltage by 900.

None is correct.

Leads the voltage by 900.

Is in phase with the voltage.

All of the following have the same units except:

impedance.

inductance.

resistance.

capacitive reactance.