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Magnetics question

2023 · 31 Jan · Shift 1 · Q54
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Magnetics question

2023 · 31 Jan · Shift 1 · Q54

JEE MainPhysicsMagneticsMCQ+4 / −1
A rod with circular cross-section area 2 cm22 \mathrm{~cm}^{2}2 cm2 and length 40 cm40 \mathrm{~cm}40 cm is wound uniformly with 400 turns of an insulated wire. If a current of 0.4 A0.4 \mathrm{~A}0.4 A flows in the wire windings, the total magnetic flux produced inside windings is 4π×10−6 Wb4 \pi \times 10^{-6} \mathrm{~Wb}4π×10−6 Wb. The relative permeability of the rod is (Given : Permeability of vacuum μ0=4π×10−7NA−2\mu_{0}=4 \pi \times 10^{-7} \mathrm{NA}^{-2}μ0​=4π×10−7NA−2)
  1. A
    516\frac{5}{16}165​
  2. B
    125
  3. C
    325\frac{32}{5}532​
  4. D
    12.5
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