SOLUTIONS.

4.

b.

5.

oppose

6.

b.

7.

8.

Lenz's law states that the induced emf in any circuit is always in a direction to

_______________ the effect that produced it.

(aid/oppose)

9.

Select the definition of inductance.

a.

b.

Inductance is the property of an object to oppose any change in its state of motion.

c.

Inductance is the property of an electrical circuit that opposes a change in current.

d.

Inductance is the property of an electrical circuit that opposes current flow.

10.

What is the polarity of the induced counter emf in the conductor shown above at the instant the switch is

closed; a or b.

a.

b.

11.

State the relationship between a changing current in a conductor and the magnetic field surrounding the

conductor.

12.

State Lenz's law.