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 ,