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JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Alternating Current

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What happens to the inductive reactance and the current in a purely inductive circuit if the frequency is halved?
  1. (A)Both, inducting reactance and current will be doubled.
  2. (B)Inductive reactance will be halved and current will be doubled.✓ Correct
  3. (C)Inductive reactance will be doubled and current will be halved.
  4. (D)Both, inductive reactance and current will be halved.

Answer: (B)

Solution

The inductive reactance is proportional to the frequency, so halving halves . Across a supply of fixed voltage the current in a purely inductive circuit is , so a reactance reduced to half doubles the current. The inductive reactance is halved and the current is doubled.

JEE Main · 2021 · 17 Mar 2021 · Shift 2 · Single correct option

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