The magnetic flux through a surface of area A placed in a uniform magnetic
field B is defined as,
FB = B A = BA cos q
where q is the angle between B and A 2 Faraday’s laws of induction imply that the emf induced in a coil of N
turns is directly related to the rate of change of flux through it,
dB
Nd
Φt
ε = −
Here FB is the flux linked with one turn of the coil