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NEET Physics Electromagnetic Induction 2024 NEET 2024 (Re-NEET)

NEET Physics Question (2024) — Solution

Question

Let us consider two solenoids A and B, made from same magnetic material of relative permeability _r and equal area of cross-section. Length of A is twice that of B and the number of turns per unit length in A is half that of B. The ratio of self inductances of the two solenoids, L_A: L_B is

Options

  1. A. 1: 2
  2. B. 2: 1
  3. C. 8: 1
  4. D. 1: 8

Answer

A. 1: 2

Step-by-step solution

L= _0 _r n A N L= _0 _r n A N l l L= _0 _r n^2 A I L n^2 I L_A L_B = n_A^2 n_B^2 I_A I_B L_A L_B = 1 4 2= 1 2

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