What is the basic cause of induced e.m.f.?

A wire of length 0.1 m moves with a speed of 10 m s^-1 perpendicular to a magnetic field of induction 1 Wb m^-2 . What is the value of induced e.m.f.?

A closely wound rectangular coil of 200 turns and size 0.3 m xx 0.1 m is rotating in a magnetic field of induction 0.005 Wb m^-2 with a frequency of 1,800 r.p.m. about an axis normal to the field. Calculate the maximum value of induced e.m.f.

What is the basic cause of quantisation of charge?

What is the basic cause of refraction of light?

What is the basic cause of refraction of light?

What is the basic cause of quantisation of charges ?