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A gramophone disc of brass of diameter 3...

A gramophone disc of brass of diameter 30 cm rotates horizontally at the rate of `100//3` revolutions per minute. If the vertical component of the earth's magnetic field be `0.01" weber"//"metre"^(2)`, then the emf induced between the centre and the rim of the disc will be-

A

`7.065 xx10^(-4) V`

B

`3.9xx10^(-4) V`

C

`2.32xx10^(-4) V`

D

None of the above

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