Calculate the magnetic field at point ‘O’ in the following case.

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B=3μ0i8R⊗

B=3μ0i4R⊗

B=5μ0i4R⊙

B=2μ0i3R⊙

answer is A.

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Detailed Solution

The magnetic field due to straight wires will be zero. Magnetic field due to circular part.Bcircular=μ0i2Rθ2π=μ0i2R(3/2)π2π=3μ0i8R⊗

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