Electro Magnetic Induction And Alternating Currents Question 420

Question: A rectangular coil ABCD is rotated anticlockwise with a uniform angular velocity about the axis shown in diagram below. The axis of rotation of the coil as well as the magnetic field B are horizontal. The induced e.m.f. in the coil would be maximum when [Haryana CEE 1996; MP PMT 1992, 94, 99]

Options:

A) The plane of the coil is horizontal

B) The plane of the coil makes an angle of 45° with the magnetic field

C) The plane of the coil is at right angles to the magnetic field

D) The plane of the coil makes an angle of 30° with the magnetic field

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Answer:

Correct Answer: A

Solution:

Emf = $ e=e_{0}\sin \theta ; $ e will be maximum when q is 90o i.e. plane of the coil will be horizontal.



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