A galvanometer of resistance $20 \,\Omega$ is to be converted into an ammeter of range $1\, A$. If a current of $1\, mA$ produces full scale deflection, the shunt required for the purpose is ................ $\Omega $
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(c) $\frac{i}{{{i_g}}} = 1 + \frac{G}{S}$$ \Rightarrow \,\,\,\,\,\frac{1}{{{{10}^{ - 3}}}} = 1 + \frac{{20}}{S} \Rightarrow S = \frac{{20}}{{999}} \approx 0.02\,\Omega $.
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