Question

When a 12 $\Omega$ resistor is shunted with a moving coil galvanometer, its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is

• A. $24\Omega$
• B. $36\Omega$
• C. $48\Omega$
• D. $60\Omega$

Answer 1

The correct option is C $48\Omega$

The ratio of the deflections in two cases :
$n=\frac{50}{10}=5$

As, $G=S(n-1)$
$\therefore G=48\Omega$