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      Question

      Self-inductance of a long solenoid is directly

      proportional to:
      A Square of the number of turns Correct Answer Incorrect Answer
      B Current through it Correct Answer Incorrect Answer
      C Radius of the solenoid Correct Answer Incorrect Answer
      D Frequency of AC Correct Answer Incorrect Answer

      Solution

      The self-inductance L of a solenoid is given by the formula: Where, ╬╝0┬аis the permeability of free space, N is the number of turns, A is the cross-sectional area of the solenoid, l is the length of the solenoid. Therefore, the self-inductance is directly proportional to the square of the number of turns.

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