Question

A galvanometer of 50 gives full scale deflection with 2 mA current as to convert it into ammeter range of 10 A is connected with it then shunt resistance will be

• A. $0.1\Omega$
• B. $0.2\Omega$
• C. $0.01\Omega$
• D. $0.001\Omega$

Answer 1

Answer: (C)

$0.01\Omega$

Galvanometer has resistance $G=50$ ohm and let S ohm be required shunt resistance connected in parallel to convert it into an ammeter of range nI.

Where, $n=$ $\frac{10}{(2\times {10}^{-}{}^3)}=5\times {10}^3$

$S\times I(n-1)=I\times G$

$S=\frac{G}{n-1}=\frac{50}{5000-1}=0.01$ ohm