Define current sensitivity and voltage sensitivity of a galvanometer. Increasing the current sensitivity may not necessarily increase the voltage sensitivity of a galvanometer. Justify,

Explanation

Current sensitivity: Current sensitivity of the galvanometer is defined as deflection of galvanomete per unit current
Current sensitivity `= (alpha )/( I ) = ( NBA)/( K). ` S.I. unit: Radian/ampere.
Voltage sensitivity : It is defined as the deflection of meter per unit voltage
voltage sensitivity `= (alpha )/( V) = ( alpha )/( RI) = ( NBA)/( KR)`
S.I. Unit : radian /volt.
We can increase the current senstivity of the galvanometer by increasing N, the voltage senstivity will remain constant as long as other parameters remain unchanged.