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A circular copper disc of 10 cm in diame...

A circular copper disc of 10 cm in diameter rotates at `1800` revolution per minute about an axis through its centre and at right angles to disc. A uniform field of induction B of `1Wb^(-2)m` is perpendicular to disc. What potential difference is developed between the axis of the disc and the rim?

A

`0.023V`

B

`0.23V`

C

`23V`

D

`230V`

Text Solution

Verified by Experts

The correct Answer is:
B
Here, `l=r=5cm=5xx10^(-2)m`
`omega=2pi((1800)/(60))"rad" s^(-1)=60 pi "rad" s^(-1)`,
`B=1WB m^(-2)`
`epsi=(1)/(2)Bl^(2) omega=(1)/(2)xx1xx(5xx10^(-2))^(2)xx60pi=0.23V`
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