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The magnetic field inside a current carrying very long solenoid is

Options

  1. AUniform
  2. BNon-uniform
  3. CZero
  4. DHighest at mid-point

Correct answer

A. Uniform

Step-by-step solution

For a very long current-carrying solenoid, the magnetic field at any point well inside it is given by B = ₀ n I , where ₀ is the permeability of free space, n is the number of turns per unit length, and I is the steady current. Since the parameters n and I are constant, the magnetic field has a constant magnitude. Furthermore, the direction of the magnetic field is parallel to the axis of the solenoid throughout its interior. Therefore, the magnetic field inside a very long solenoid is uniform.

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