What do you mean by current sensitivity of a galvanometer

Solution,
Current sensitivity of a galvanometer is the deflection caused by the galvanometer for a unit flow of current through the circuit. Greater the deflection higher is the sensitivity.
It is expressed as:
$$\begin{gathered} current sensitivity=\frac{\theta }{I}=\frac{NBA}{k} \\ where, \\ N is the number of turns in the coil \\ B is the strength of the magnetic field in which the coil is suspended \\ A is the area of the coil \\ k is the restoring torque per unit twist of the the string \end{gathered}$$