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A conducting ring of radius 'r' is rolli...

A conducting ring of radius `'r'` is rolling without slipping with a constant angular velocity `omega` (figure). If the magnetic field strengh is `B` and is directed into the page the emf induced across `PQ` is

A

`Bomegar^2`

B

`(Bomegar^2)/2`

C

`3Bomegar^2`

D

`(pi^2r^2Bomega)/8`

Text Solution

Verified by Experts

The correct Answer is:
A
`|vecE|=(Bt^2)/2omega,l=sqrt(2)r`
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NARAYNA-ELECTROMAGNETIC INDUCTION-EXERCISE-1 (C.W)
  1. A thin semicircular conducting ring of radius R is falling with its pl...

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  2. Two thick rods AB, CD are placed parallel to each other at a distance ...

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  3. A conducting ring of radius 'r' is rolling without slipping with a con...

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  4. A cycle wheel with 64 spokes is rotating with N rotations per second a...

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  5. A uniform circular metal disc of radius R is rotating about a vertical...

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  6. a copper disc of diameter 20 cm makes 1200 r.p.m. about its natural ax...

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  7. In an AC generator, a coil with N turns, all of the same area A and to...

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  8. A flat circular coil having N turns (tightly wound D) is placed in a t...

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

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

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

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

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  13. The number of turns of primary and secondary coils of a transformer ar...

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

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

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

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

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

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

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

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