Question

Define current sensitivity of a galvanometer. Write its expression.
b. A galvanometer has resistance G and shows full scale deflection for current Ig.
i. How can it be converted into an ammeter to measure current up to I0 (I0 > Ig)?
ii. What is the effective resistance of this ammeter?​

Answer 1

Explanation:

Current sensitivity of a galvanometer is defined as the deflection produced in the galvanometer when a unit current flows through it. Where n is no of turns in the coil of galvanometer, B is Magnetic field around coil, A is Area of coil and c is restoring torque per unit twist.