Q. The magnetic field at the center of a solenoid is directly proportional to:

  • (A) Length of solenoid
  • (B) Current and turns per unit length
  • (C) Resistance
  • (D) Radius only
✅ Correct Answer: (B) Current and turns per unit length
Explanation: The magnetic field inside a long solenoid is B = μ₀nI.

Published by Jyoti ⭐ 1.79K Points at 15-Jun-2026 01:35 pm in Physics

Explanation by: Jyoti
The magnetic field inside a long solenoid is B = μ₀nI.

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