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JEE Physics · Medium

Magnetism: Shunt Resistance MCQ

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Shunt ResistanceMediumQuestion 20207

Question

A galvanometer of resistance 50 Ω gives full deflection at 1 mA. Shunt needed to convert it to an ammeter reading up to 1 A is:
  1. A
    0.05 Ω
    Correct
  2. B
    0.5 Ω
  3. C
    5 Ω
  4. D
    50 Ω

Correct answer

0.05 Ω

Explanation

S = G·Ig/(I−Ig) = 50 × 0.001/(1 − 0.001) ≈ 50 × 0.001/0.999 ≈ 0.05 Ω.

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