A circular cpper 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`

A circular cpper disc of 10 cm in diameter rotates at 1800 revolution

1.	A circular cpper 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`
Answer» Correct Answer - 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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