Questions
A square-shaped coil of edge a having turns is rotated with a uniform angular velocity about one of its diagonals which is kept fixed in a horizontal position. A uniform magnetic field exists in the vertical direction. Find the emf induced in the coil.
detailed solution
Correct option is C
The area of the square frame is . If the normal to the frame makes an angle with the magnetic field at t =0, this angle will become after some time .
The flux of the magnetic field at this time is .
The induced emf is
Thus, an alternating emf is induced in the coil.
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