Concept of Inductor

Question

Current i is passed through an inductor. For the given situations, inductor will behave as:

Solution

When !!(di)/(dt)!! is positive, current is increasing with time. Inductor will oppose the flow of the current according to Lenz's law. So, inductor behaves like !!I!!.

When !!(di)/(dt)!! is negative, current is decreasing with time. Inductor will support the flow of the current according to Lenz's law. So, inductor behaves like !!II!!.

Therefore, option (a) and (d) are correct.