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

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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
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