A) \[250\,\,\Omega \]
B) \[25\,\,\Omega \]
C) \[40\,\,\Omega \]
D) \[500\,\,\Omega \]
Correct Answer: A
Solution :
Current sensitivity \[{{\text{I}}_{\text{S}}}\text{=}\frac{\text{NBA}}{\text{C}}\] Voltage sensitivity \[{{\text{V}}_{\text{S}}}\text{=}\frac{\text{NBA}}{\text{C}{{\text{R}}_{\text{G}}}}\] So, resistance of galvanometer \[{{\text{R}}_{G}}=\frac{{{I}_{S}}}{{{V}_{S}}}=\frac{5\times 1}{20\times {{10}^{-3}}}=\frac{5000}{20}=250\Omega \]
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