Question

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

• A. $0.01\,\Omega$
• B. $0.05\,\Omega$
• C. $0.02\,\Omega$
• D. $0.04\,\Omega$

Answer 1

Answer: (C)

$0.02\,\Omega$

Answer 2

$S=\frac{I_{g} G}{I-I_{g}}$ $=\frac{10^{-3} \times 20}{1-1 \times 10^{-3}}=0.02\, \Omega$