Question

A circuit is connected to an ac source of variable frequency. As the frequency of the source is increased, the current first increases and then decreases. Which of the following combinations of elements is likely to comprise the circuit?

Options

• L, C and R

• L and C

• L and R

• R and C

Answer 1

L, C and R

Explanation:

In a series LCR circuit, the frequency vs. circuit current graph shows that current climbs initially, reaches a peak, and then declines as frequency increases.

Hence, the circuit contains a combination of L, R and C.