The diagram shows an inductor that is part of a circuit.The direction of the emf induced in the inductor is indicated.Which of the following is possible?
A)The current is constant and rightward
B)The current is constant and leftward
C)The current is increasing and rightward
D)The current is increasing and leftward
E)None of the above

Question

The diagram shows an inductor that is part of a circuit.The direction of the emf induced in the inductor is indicated.Which of the following is possible? 
A)The current is constant and rightward 
B)The current is constant and leftward 
C)The current is increasing and rightward 
D)The current is increasing and leftward 
E)None of the above

Quizplus · Accepted Answer

According to Lenz's Law, the direction of the induced emf in an inductor opposes the change in current through it. Therefore, as the current through the inductor is increasing (as indicated by the arrow), the induced emf will be in the opposite direction (leftward). This means that the current must be increasing and leftward to produce the induced emf shown in the diagram. Therefore, choice D is the best answer.

The Diagram Shows an Inductor That Is Part of a Circuit.The