Magnetic Effects & Magnetism

JEE Main level, single correct, medium

101 of 276

Question 101 of 276

Two concentric coils each of radius equal to 2πcm2 \pi \mathrm{cm} are placed at right angles to each other. 3 Ampere and 4 ampere are the currents flowing in each coil respectively. The magnetic induction in Weber /m2/ \mathrm{m}^2 at the centre of the coils will be (μ0=4π×10−7\left(\mu_0=4 \pi \times 10^{-7}\right. Wb/A-m)

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Answer: (C) 5×10−55 \times 10^{-5}

B=μo2rI12+I22B=\frac{\mu_o}{2 r} \sqrt{I_1^2+I_2^2}
B=4π×10−72×2π×10−2×5B=\frac{4 \pi \times 10^{-7}}{2 \times 2 \pi \times 10^{-2}} \times 5
B=5×10−5B=5 \times 10^{-5}

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