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NEET 2019 Physics question

PhysicsElectromagnetic InductionNEET 2019

A 800 turn coil of effective area 0.05 m is kept perpendicular to a magnetic field T. When the plane of the coil is rotated by around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

Answer: (4)

Solution

Initially the coil is perpendicular to the field, so the flux linkage is ; after rotating by the plane is parallel to the field and the flux is \cos$

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Question ID VK-092415