In the moving coil galvanometer

Question

Professor PC Thomas Classes · Answer

The current sensitivity is defined as
$
\frac{	ext { deflection }}{	ext { current }}=\frac{\phi}{l}=\frac{N B A}{k}
$
and voltage sensitivity is defined as
$
\frac{\phi}{V}=\frac{\phi}{I R}=\frac{N B A}{k R}
$
By increasing the number of number of turns the resistance also increases, therefore, voltage sensitivity is independent of the number of turns.