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JEE Main 2023 (25 Jan, Shift 1) · Magnetisation: B, H, M, χ & μ

Magnetisation: B, H, M, χ & μ question from JEE Main 2023 (25 Jan, Shift 1)

Q28JEE Main 2023 · 25 JAN · SHIFT 1Easy

Magnetisation: B, H, M, χ & μ

A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is:

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Answer: (c)

  1. Magnetic intensity inside a long solenoid: H=nIH = nI (independent of the core and the diameter).
  2. n=12002=600 m−1n = \dfrac{1200}{2} = 600\ \text{m}^{-1}
  3. H=600×2=1.2×103 A m−1H = 600 \times 2 = 1.2 \times 10^{3}\ \text{A m}^{-1}
  4. So the answer is (c).
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