ELECTROMAGNETIC INDUCTION Calculation of induced emf and charge.
LINEAR CONDUCTOR AT 900 TO UNIFORM FIELD
A linear conductor of length l moves a distance d through a uniform field B in time t. The
area moved through is equal to l * d, so the flux cut = B A = B l d. The P.D, E = - d Q / d t = B l d / t
A COIL ROTATING IN UNIFORM FIELD
A coil or N turns and area A is rotating at uniform angular speed w, at a time t the coil will be at
angle w t to the field, hence the flux cut is given by Q = B A N Sin( w t ), differentiating to find the P.D. E = B A N w Cos( w t )
A COIL ROTATING IN UNIFORM FIELD
A search coil, area A and turns N, kept still in a alternating field equal to B0 Sin( t ), the flux
linkage is given by B A i.e. Q = A B0 Sin( t ), so the PD is given byE = N A B0 Cos( t )
