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A thin circular ring of area A is perpen...

A thin circular ring of area `A` is perpendicular to uniform magnetic field of induction `B`. `A` small cut is made in the ring and a galavanometer is connected across the ends such that the total resistance of circuit is `R`. When the ring is suddenly sqeezed to zero area, the charge flowing through galvanometer is:

A

`(BR)/A`

B

`(AB)/R`

C

`ABR`

D

`(B^2A)/(R^2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`Q=(Deltaphi)/R=(phi_2-phi_1)/R=(BA=0)/R=(BA)/R`
`=6xx10^-3=6mWb`
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NARAYNA-ELECTROMAGNETIC INDUCTION-EXERCISE-1 (H.W)
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  3. A coil having an area 2m^(2) is placed in a magnetic field which chang...

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  4. A flip coil consits of N turns of circular coils which lie in a unifo...

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  5. A conductor AB of length l moves in x y plane with velocity vec(v) = v...

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  6. To measure the field 'B' between the poles of an electronmagnet, a sma...

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  7. A thin circular ring of area A is perpendicular to uniform magnetic fi...

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  8. A short-circuited coil is placed in a time-varying magnetic field. Ele...

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  9. A train is moving towards north with a speed of 25 m/s. if the vertic...

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  10. A conducting square loop of side L and resistance R moves in its to on...

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  11. A metal rod moves at a constant velocity in a direction perpendicular ...

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  12. A thin flexible wire of length L is connected to two adjacent fixed po...

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  13. A coil has an inductance of 0.05 H and 100 turns and 0.02 A current i...

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  14. A current of 2A is increasing at a rate of 4A//s through a coil of ind...

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  15. The current decays from 5A to 2A in 0.01 s in a coil. The emf induced ...

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  16. A varying current in a coil change from 10A to 0A in 0.5 sec. If the a...

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  17. An air cored solenoid is of length 0.3 m, area of cross section 1.2 xx...

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  18. A solenoid of length 50 cm with 20 turns per cm and area of cross sect...

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  19. The current in a coil is changed from 5A to 10 A in 10^(-2) s. An emf ...

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  20. A small square loop of wire of side l is placed inside a large square ...

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