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A circular ring of diameter 20 cm has a ...

A circular ring of diameter 20 cm has a resistance of `0.01 Omega`. The ring is turned from a position perpendicular to a uniform magnetic field of 2T to a position parallel to the field. The amount of charge flowing through the ring in this process is

A

`pi C`

B

`2 piC`

C

`8 pi C`

D

`2 C`.

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