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Question 31520
JEE Physics · Medium

Capacitance: Variable Capacitor MCQ

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Variable CapacitorMediumQuestion 31520

Question

In a variable capacitor (tuning capacitor in a radio), capacitance is varied by changing:
  1. A
    Plate area overlap
    Correct
  2. B
    Dielectric constant only
  3. C
    Supply voltage
  4. D
    Plate material

Correct answer

Plate area overlap

Explanation

Rotating one set of plates changes the effective overlap area, varying C = ε₀A_eff/d.

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