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Q.

A circular coil of radius 10 cm, 500 turns and resistance 2 Ω is placed with its plane, perpendicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical diameter through 90° in 0.25 s. The induced e.m.f. in the coil is (Take HE=3.0x 10-5T):

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a

1.9x10-3 V

b

2.6 x 10-2 V

c

3.8x10-3 V

d

1.4x10-2 V

answer is D.

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Detailed Solution

ε=dϕBdt=NBAt=500×3×105×3.14  ×0.1  ×0.10.25=18.84  ×  104=1.9  ×  103V

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