A) remains the same
B) is halved
C) is doubled
D) is quadrupled
Correct Answer: C
Solution :
Consider that the moving coil galvanometer consists of a coil of n turns and possesses area A and resistance R. When a potential difference V is applied, suppose that a current i flows through the galvanometer and the coil deflects through angle a. Then, current sensitivity of the galvanometer, \[\frac{\alpha }{i}=\frac{nAB}{k}\] and voltage sensitivity of the galvanometer \[\frac{\alpha }{V}=\frac{\alpha }{iR}\] \[=\frac{nAB}{kR}\] Thus, the voltage sensitivity of galvanometer also gets doubled.
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