Physics Current, Resistance and Electricity Resistance and Resistivity

A galvanometer has a coil of resistance 200 Ω with a full scale deflection at 20 μA. The value of resistance to be added to use it as an ammeter of range (0–20) mA is:

1

0.40 Ω

2

0.20 Ω

3

0.50 Ω

4

0.10 Ω

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