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Q.

A circular coil of area 8 m2 and number of turns 20 is placed in a magnetic field of 2 T with its plane perpendicular to it. It is rotated with an angular velocity of 20 rev/s about its natural axis. The emf induced is

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a

zero

b

400 πV

c

400 V

d

800 πV

answer is C.

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Detailed Solution

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About natural axis emf induced in it is equal to zero. Because there is no change of flux.

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A circular coil of area 8 m2 and number of turns 20 is placed in a magnetic field of 2 T with its plane perpendicular to it. It is rotated with an angular velocity of 20 rev/s about its natural axis. The emf induced is