Question

A $ 50\,ohm $ galvanometer gets full scale deflection when a current of $ 0.01\, A $ pass through the coil. When it is converted to a $ 10 \,A $ ammeter, the shunt resistance is

• A. $ 0.01\,\Omega $
• B. $ 0.05\,\Omega $
• C. $ 2000\,\Omega $
• D. $ 5000\,\Omega $

Answer 1

Answer: (B)

Resistance of galvanometer $G=50\, \Omega$
$I_{g}=0.01\,A, I=10\,A$
Shunt resistance, $S=\frac{I_{g}\,G}{I-I_{g}}$
$=\frac{0.01\times50}{10-0.01}=0.05\,\Omega$