Motional Emf
If a rod of length 1 moves perpendicular to a magnetic field B, with a velocity v, then induced emf produced in it given by
E = B * v * I = bvl
If a metallic rod of length 1 rotates about one of its ends in a plane perpendicular to the magnetic field, then the induced emf produced across its ends is given by
E = 1 / 2 bωr 2 = BAf where, ω = angular velocity of rotation, f = frequency of rotation and A = πr 2 = area of disc.
The direction of induced current in any conductor can be obtained from Fleming’ s right hand rule.
A rectangular coil moves linearly in a field when coil moves with constant velocity in a uniform magnetic field, flux and induced emf will be zero.