A circular coil of radius 8 cm, 400 turns and resistance 2 
is placed with its plane perpendicular to the horizontal component of the earth’s magnetic field. It is rotated about its vertical diameter through 180° in 0.30 s. Horizontal component of earth magnetic field at the place is 3 × 10 -5 T. The magnitude of current induced in the coil is approximately
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Initial flux through the coil
Final flux after the rotation
The magnitude of induced emf is
Current 
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