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Question

A galvanometer having a coil resistance of 100 Ω gives a full scale deflection when a current of 1 mA is passed through it. The value of the resistance which can convert this galvanometer into an ammeter giving a full scale deflection for a current of 10 A, is

A
0.01 Ω
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B
2 Ω
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C
0.1 Ω
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D
3 Ω
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Solution

The correct option is A 0.01 Ω
When full-scale current is flowing, potential difference
V=103×100=0.1 V

Let shunt resistance be R. Current flowing through R in full scale reading is Ish=100.001=9.999 A

V=IshR
0.1=9.999R
R0.01 Ω

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