# Question: a sphere generates a fem didt if the sphere rotates...

###### Question details

A sphere generates a fem =-dI/dt. If the sphere rotates at a
constant angular speed w, the flux is equal to I(t)=BS cos wt,
where B is the intensity of the magnetic field and S the area of
the shpere. Calculate the fem at t=10sec, assuming w=2 rad/s,
B=1,2T and S=5cm^2