Where, N = number of turns in the coil E = magnetic field intensity
I = current 10 the coil and A = area of cross-section of the coil, θ = angle between magnetic field and normal to the plane of the coil.
Moving Coil Galvanometer
It is a device used for the detection and measurement of the currents. In equilibrium, deflecting torque = restoring torque
where, k = restoring torque per unit twist, N = number of turns in the coil, B = magnetic field intensity,