The number of turns in a coil of Galvanometer is tripled, then

Options

A. Both voltage and current sensitivity remains constant
B. Voltage sensitivity increases 3 times and current sensitivity remains constant
C. Both voltage and current sensitivity decreases by `33%`
D. Voltage sensitivity remains constant and current sensitivity increases 3 times.

Answer

D

Explanation

(d): `phi/1 = (NBA)/(k)`
Larger the number of turns more will be the deflection due to large magnetic field created, so current sensitivity is increased.
`phi/V = (NBA)/(k) xx 1/R`
Also, R `prop` N.So `phi//V` is independent of N.