A galvanometer of resistance 20Ω is to be converted into an ammeter of range 1A. If a current of 1mA produces full-scale deflection, the shunt required for the purpose is
A
0.01Ω
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B
0.05Ω
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C
0.02Ω
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D
0.04Ω
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Solution
The correct option is C0.02Ω Given, RG=20Ωi=1Aig=1mA
here, (i−ig)Rs=igRG Rs=igRG(i−ig)Rs
using the given values,