Question

In a galvanometer, the deflection becomes one half when the galvanometer is shunted by a $20\Omega$ resistor. The galvanometer resistance is

• A. $5\Omega$
• B. $10\Omega$
• C. $40\Omega$
• D. $20\Omega$

Answer 1

Answer: (D)

$20\Omega$

From figure:

$20\times \frac{I}{2}=G\times \frac{I}{2}$

Hence, $G=20$ ohm.