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Question 20170
JEE Physics · Medium

Magnetism: Ampere's Law — Solenoid MCQ

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Ampere's Law — SolenoidMediumQuestion 20170

Question

Magnetic field inside a long solenoid with n turns per unit length carrying current I is:
  1. A
    μ₀nI
    Correct
  2. B
    μ₀I/n
  3. C
    nI/μ₀
  4. D
    μ₀n/I

Correct answer

μ₀nI

Explanation

Applying Ampere's circuital law to a solenoid gives B = μ₀nI inside, 0 outside (ideal solenoid).

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