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NEET 2020 (Phase 1) · Magnetisation: B, H, M, χ & μ

Magnetisation: B, H, M, χ & μ question from NEET 2020 (Phase 1)

Q41NEET 2020 · PHASE 1Easy

Magnetisation: B, H, M, χ & μ

An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m-1. The permeability of the material of the rod is:

(μ0=4π×10−7 TmA−1)\left(\mu_0 = 4\pi \times 10^{-7}\text{ TmA}^{-1}\right)

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Answer: (d)

  1. μr=1+χ=600\mu_r = 1 + \chi = 600 (the field 1200 A/m is not needed).
  2. μ=μrμ0=600×4π×10−7=2400π×10−7\mu = \mu_r\mu_0 = 600\times4\pi\times10^{-7} = 2400\pi\times10^{-7}
  3. μ=2.4π×10−4 TmA−1\mu = 2.4\pi\times10^{-4}\text{ TmA}^{-1}
  4. So the answer is (d).
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