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A long solenoid carrying a current produ...

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, then new value of magnetic field is

A

B

B

2B

C

4B

D

B/2

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MODERN PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT-EXERCISE
  1. A straight wire of mass 200 g and length 1.5 m carries a current of 2 ...

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  2. The magnetic field at a distance r from a long wire carryimg current I...

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  3. A long solenoid carrying a current produces a magnetic field B along i...

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  4. The device used for producing electric current is

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  5. At the time of short circuit,the current in the circuit.

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  6. State whether the following statements are true or false: An electric ...

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  7. True or false A constant magnetic flux in a coil can induce current in...

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  8. True or false AC is more dangerous as compared to DC.

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  9. True or false AC is the best suitable for electroplating.

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  10. True or false The function of a fuse wire depends on its length.

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  11. Fill ups Electromagnetic induction is the phenomenon of converting…………...

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  12. Fill ups Fleming's left hand rule enables us to find the direction of ...

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  13. Fill ups ……………..cannot be used for electroplating.

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  14. Fill ups Live wire has …………….coloured insulation.

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  15. Fill ups Short circuiting occurs when live and………………wires come in cont...

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  16. When does an electric short circuit occur?

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  17. Which sources produce alternating current?

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  18. What is the principle of working of an A.c generator?

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  19. What is the function of earth wire? Why is it necessary to earth metal...

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  20. With the help of magnetic field lines how can you find the direction a...

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