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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, the new value of magnetic field will be equal to

Option 1 -

B           

Option 2 -

2B

Option 3 -

4B

Option 4 -

B 2

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    2 months ago
    Correct Option - 1


    Detailed Solution:

      B = η μ 0 l

     if l ->2l

    η → n 2                

    B 1 = n 2 μ 0 2 l

    B 1 = B                

                   

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