The magnetic field inside a long straight solenoid-carrying current

  1. A. is zero
  2. B. decreases as we move towards its end
  3. C. increases as we move towards its end
  4. D. is uniform inside the solenoid

Correct Answer: D. is uniform inside the solenoid

Explanation

The magnetic field inside a long, straight, current-carrying solenoid is essentially uniform and parallel to the axis of the solenoid.

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