Magnetic Effects & Magnetism

JEE Main level, single correct, medium

96 of 276

Question 96 of 276

A horizontal overhead power line is at a height of 4 m4 \mathrm{~m} from the ground and carries a current of 100 A100 \mathrm{~A} from east to west. The magnetic field directly below it on the ground is (μ0=4π×10−7 T m A−1)\left(\mu_0=4 \pi \times 10^{-7} \mathrm{~T} \mathrm{~m} \mathrm{~A}^{-1}\right)

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Answer: (C) 5×10−65 \times 10^{-6} T southward

B=μ02πiR=4π×10−72π×1004=5×10−6 T southward B=\frac{\mu_0}{2 \pi} \frac{i}{R}=\frac{4 \pi \times 10^{-7}}{2 \pi} \times \frac{100}{4}=5 \times 10^{-6} \mathrm{~T} \text { southward }

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