In a moving coil galvanometer, torque on the coil the wire can be expressed as τ = ki , where i is current through the wire and k is constant. The rectangular coil of the galvanometer having number of turns. N, area A and moment of inertia I is placed in magnetic field B. Find . (a) k in terms of given parameters N, I, A and B(b) the torsion constant of the spring, if a current i­0 produces a deflection of π / 2 in the coil.(c) the maximum angle through which the coil is deflected, if charge Q is passed through the coil almost instantaneously. (ignore the damping in mechanical oscillations)

Shane Macguire , 10 Years ago

Grade upto college level