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On making a coil of copper wire of lengt...

On making a coil of copper wire of length  and coil radius r, the value of self inductance is obtained as L. If the coil of same wire, but of coil radius r/2, is made, the value of self inductance will be-

A

2L

B

L

C

4L

D

L/2

Text Solution

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The correct Answer is:
a
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MOTION-ELECTRO MAGNETIC INDUCTION-EXERCISE-1
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  2. Out of the two coils placed near each other, when a current of 2 amp i...

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  3. An inductor may store energy in

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  4. On making a coil of copper wire of length  and coil radius r, the val...

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  5. v34

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  6. The coefficient of coupling between two coil is maximum when the two c...

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  7. Two coils of self-inductance L(1) and L(2) are placed closed to each o...

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  8. The mutual inductance of an induction coil is 5H . In the primary coil...

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  9. The value of coefficient of mutual induction in two coils can be incre...

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  10. If the current in the primary coil is reduced from 3.0 ampere to zero ...

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  11. A solenoid having a core of cross-section 4cm^(2), half air and half i...

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  12. The coefficients of self induction of two inductance coil are 0.01 H a...

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  13. Two identical solenoid coils, each of self inductancen L are connected...

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  14. If two coils of negligible mutual induction and having coefficient of ...

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  15. To transmit electrical energy from a generator to distant consumers

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  16. A step down transformer is used to reduce the main supply of 200 V to ...

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  17. A step up transformer operates on a 230 V line and a load current of 2...

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  18. A transformer is used to light a 140 W, 24 V lamp from 240 V AC mains....

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  19. In a step-up transformer, in comparison with the secondary the primary...

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  20. In the secondary coil of step-up transformer , the number of turns are

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