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A long solenoid has 1000 turns. When a current of 4A flows through it, the magnetic flux linked with each turn of the solenoid is 4 × 10⁻³ Wb. The self inductance of the solenoid is:

  1. 4H
  2. 3H
  3. 2H
  4. 1H

Correct answer: 4H

Solution

The self-inductance (L) of the solenoid is given by the formula L = NΦ/I, where N is the number of turns, Φ is the magnetic flux per turn, and I is the current. Substituting the values: L = (1000 × 4 × 10⁻³) / 4 = 4 H.

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