A moving coil galvanometer allows a full scale current of 10 - 4 A . A series resistance of 2 × 10 4 Ω is required to convert the galvanometer into a voltmeter of range 0 - 5 V . Therefore, the value of shunt resistance required to convert the above galvanometer into an ammeter of range 0 - 10 m A is:

Question

A moving coil galvanometer allows a full scale current of 10 - 4 A . A series resistance of 2 × 10 4 Ω is required to convert the galvanometer into a voltmeter of range 0 - 5 V . Therefore, the value of shunt resistance required to convert the above galvanometer into an ammeter of range 0 - 10 m A is:, 100 Ω, 200 Ω, 300 Ω, 10 Ω

MARKS App · Accepted Answer

i g = 10 - 4 A i = 10 × 10 - 3 A R V = 20 k Ω i g G + i g R V = 5 i g G = i - i g R A R A = i g G i - i g = i g 5 - i g R V i - i g i g R A = 5 - i g R V i - i g ≈ 300 Ω

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