Target Exam

CUET

Subject

Physics

Chapter

Alternating Current

Question:

The same current is flowing in two AC circuits. The first circuit contains a pure inductor and the second, a capacitor. If the frequency of the AC is increased, then the current will.

Options:

increase in the first but decrease in the second

increase in both

decrease in both

decrease in the first and increase in the second

Correct Answer:

decrease in the first and increase in the second

Explanation:

The correct answer is Option (4) → decrease in the first and increase in the second

Inductive reactance $(X_L)∝f$ [f = frequency]

Capacitive reactance $(X_C)∝\frac{1}{f}$ [f = frequency]

∴ In the first circuit (inductor), the current decreases as inductive reactance increases due to increase in frequency.

In the second circuit (capacitor), the current increases as capacitive reactance decreases due to increase in frequency.