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A long solenoid of radius 1mm has 100 turns per mm. if 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

Option 1 -

6.28 * 10 - 2 T

Option 2 -

12.56 * 10 - 2 T

Option 3 -

12.56 * 10 - 4 T

Option 4 -

6.28 * 10 - 4 T

0 2 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • R

    Answered by

    Raj Pandey | Contributor-Level 9

    a month ago
    Correct Option - 2


    Detailed Solution:

    B = μ 0 n i = μ 0 N l i

    ∴ B = 4 π × 10 - 7 × 100 10 - 3 × 1 = 12.56 × 10 - 2 T

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