Inductance - Review for AP Physics C: Electricity and Magnetism

What happens to the current in a circuit when a switch is closed?

• It decreases to zero.

• It gradually increases over time.

• It instantly reaches its maximum value.

• It remains constant.

According to Lenz's law, what is the direction of the induced current?

• Parallel to the magnetic field lines.

• In the same direction as the change in magnetic flux.

• Opposite to the change in magnetic flux.

• Perpendicular to the change in magnetic flux.

What is the unit of inductance?

• Ohm

• Farad

• Henry

• Tesla

Which of the following is a property of a resistor?

• Inductance

• Conductance

• Resistance

• Capacitance

What primarily determines the inductance of a solenoid?

• The voltage applied

• The number of turns and cross-sectional area

• The current flowing through it

• The material of the wire

How does the inductance of a solenoid change with the number of turns?

• It is independent of the number of turns.

• It decreases with more turns.

• It remains constant.

• It increases with more turns.

What is the energy stored in the magnetic field of an inductor dependent on?

• The voltage across the inductor

• The current through the inductor

• The resistance of the inductor

• The temperature of the inductor

How does the energy storage mechanism in an inductor differ from that in a capacitor?

• Both store energy in magnetic fields.

• Both store energy in electric fields.

• Inductors store energy in magnetic fields, capacitors in electric fields.

• Inductors store energy in electric fields, capacitors in magnetic fields.

What happens to the magnetic field in an inductor when there is no current?

• It remains constant.

• It increases.

• It decreases to zero.

• It fluctuates.

In an LR circuit, what role does the resistor play?

• It stores energy in a magnetic field.

• It dissipates energy as heat.

• It stores energy in an electric field.

• It increases the current.