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A circular coil of 'n' turns is kept in ...

A circular coil of `'n'` turns is kept in a uniform magnetic field such that the plane of the coil is perpendicular to the field. The magnetic flux associated with the coil is now `phi`. Now the coil is opened and made into another circular coil of twice radius of the previous coil and kept in the same field such that the plane of the coil is perpendicular to the field. The magnetic flux associated with this coil now is

A

`phi`

B

`2phi`

C

`(phi)/4`

D

`(phi)/2`

Text Solution

Verified by Experts

The correct Answer is:
B
`phi=Ban n(2pir) ="constant")`
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NARAYNA-ELECTROMAGNETIC INDUCTION-EXERCISE-2 (C.W)
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  5. A wire is sliding as shown in Figure. The angle between the accelerati...

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  6. A conducting wire xy of lentgh l and mass m is sliding without frictio...

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  7. A conducitng rod AB of length l = 1 m moving at a velcity v = 4 m//s m...

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  8. A wire KMN moves along the bisector of the angle theta with a constant...

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  9. A uniform magnetic field existsin region given by vec(B) = 3 hat(i) + ...

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  10. A conducting rod PQ of length 1 m is moving with uniform velocity of 2...

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  11. A time varying magnetic field is present in a cyclindrical region R as...

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  12. A metallic square loop ABCD is moving in its own plane with velocity v...

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  13. The flux linked with a coil is 0.8 Wb when a 2 A current is flowing th...

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  14. A solenoid of self inductance 1.2 H is in series with a tangent galvan...

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  15. There are two batteries 'A' and 'B' having same emf. A has no internal...

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  16. An emf induced in a secondary coil is 10000 V when the current breaks ...

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  17. A mutual inductor consists of two coils X and Y as shown in Fig. in wh...

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  18. A long solenoid of length L, cross section A having N(1) turns has abo...

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  19. A small coil of radius r is placed at the centre of a large coil of ra...

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  20. The coefficient of mutual inductance of two circuits A and B is 3 mH a...

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