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AP EAMCET201822 Apr 2018Evening ShiftPhysicsElectromagnetic InductionActual

The length of a wire required to make a solenoid of length l and self-induction L is

Options

  1. A4 L l ₀
  2. BL I 4 ₀
  3. C2 L I ₀
  4. D₀ L I 4

Correct answer

A. 4 L l ₀

Step-by-step solution

Length of wire in solenoid =2 r N =2 r L l ₀ r^2 array c L= ₀ N^2 A l A= r^2 array = 4 L l ₀

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