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The magnetic induction at the centre of a solenoid is B. If the length of solenoid is reduced to half and the same wire is wound over it in two layers, then the new magnetic induction will be

A

B

B

2B

C

B//2

D

4B

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The correct Answer is:
B
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-II
  1. The length of a solenoid is 0.1 m and its diameter is very small. A wi...

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  2. A long solenoid has 200 turns per cm and carries a current i. The magn...

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  3. The magnetic induction at the centre of a solenoid is B. If the length...

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  4. A solenoid of 0.4111 length with 500 turns carries a current of 3A. A ...

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  5. The perpendicular distance between two conductor of 12 m each is 0.15c...

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  6. Across a long conductor 2A current is flowing. At 10 cm from it anothe...

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  7. Two parallel conductors are separated by 5cm. They carry 6A and 2A in ...

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  8. A horizontal wire carries 200A current below which another wire of lin...

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  9. There long, straingth parallel wires carrying current, are arranged as...

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  10. Find AB.

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  11. Two long conductors, separated by a distance d carry currents l(1) and...

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  12. A rectangul ar coil of wire of 100 turns and 10xx15cm^(2) size carryin...

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  13. A 16cm^(2) coil has 20 turns. Its suspended by a phosphor bronze wire ...

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  14. A rectangular coil of 500 turn 10^(-2)m^(2) area carrying 1 A is in a ...

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  15. A rectangular coil of length 0.12 m and width 0.1.m having 50 turns of...

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  16. A coil in the shape of an equilateral triangle of side l is suspended ...

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  17. A moving coil galvanometer 'A' has 200 turns and a resistance of 100Om...

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  18. two galvanometers of resistance 100Omega and 50Omega, are 10^(-8)A//"d...

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  19. A vertical circular coil of one turn and radius 9.42 cm is placed with...

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  20. A current or 0.5 A produces a deflection of 60° in a tangent galvanome...

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