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a copper disc of diameter 20 cm makes 12...

a copper disc of diameter `20 cm` makes `1200` r.p.m. about its natural axis kept parallel to a uniform magnetic field of `10^(-2)T`. The potential difference between the centre and edge of the disc is

A

`6. 28 xx 10^(-3) `V

B

`62.8 xx 10^(-3)` V

C

`0.628 xx 10^(-3)` V

D

`0.628 V`

Text Solution

Verified by Experts

The correct Answer is:
A
`e=1/2BR^2omega" where "omega=2pif`
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NARAYNA-ELECTROMAGNETIC INDUCTION-EXERCISE-1 (C.W)
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  5. A flat circular coil having N turns (tightly wound D) is placed in a t...

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  6. A uniform but time-varying magnetic field B(t) exists in a circular re...

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  7. A solenoid have self inductance 2H. If length of the solenoid is doubl...

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  8. A solenoid is wound over a rectangular frame. If all the linear dimens...

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  9. Two coils A and B having turns 300 and 600 respectively are placed nea...

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  11. Two conducting circular loops of radii R1 and R2 are placed in the sa...

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  12. If the length and area of cross-section of an inductor remain same but...

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  13. Two inductors each of inductance L are joined in parallel. Their equiv...

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  14. An air-cored coil has a self-inductance of 0.1 H. A soft iron core of ...

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  15. A solenoid is 1.5 m long and its inner diameter is 4.0 cm . It has thr...

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  16. A coil of wire of a certain radius has 600 turns and a self-inductance...

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  17. Two coils are at fixed location: When coil 1 has no corrent and the cu...

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  18. If a current of 10 A changes in one second throught a coil, and the in...

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  19. A coil of 100 turns carries a current of 5mA and creates a magnetic fl...

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  20. A solenoid of lenght 30 cm with 10 turns per centimetre and area of cr...

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