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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Magnetic Properties of Matter

NTA Abhyas 2020 · Physics · Magnetic Properties of Matter

The magnetic susceptibility of a material of a rod is 499 . The...

The magnetic susceptibility of a material of a rod is 499499. The absolute permeability of vacuum is4π×10−7Hm−14\pi \times {10}^{- 7}Hm^{- 1}. The absolute permeability of the material of a rod is

Options

  1. Aπ×10−4Hm−1\pi \times {10}^{- 4}Hm^{- 1}
  2. B2π×10−4Hm−12\pi \times {10}^{- 4}Hm^{- 1}
  3. C3π×10−4Hm−13\pi \times {10}^{- 4}Hm^{- 1}
  4. D4π×10−4Hm−14\pi \times {10}^{- 4}Hm^{- 1}

Correct answer

B. 2π×10−4Hm−12\pi \times {10}^{- 4}Hm^{- 1}

Step-by-step solution

Absolute permeability of material of rod

μ=μrμ0=(1+Xm)μ0\mu = {\mu}_{r}{\mu}_{0} = \left(1 + {X}_{m}\right){\mu}_{0}

∴μ=(1+499)×4π×10−7=2π×10−4Hm−1∴ \mu = \left(1 + 499\right) \times 4\pi \times {10}^{- 7} = 2\pi \times {10}^{- 4}Hm^{- 1}
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