Questions

Magnetic field at point A would be :

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μ0I4π

μ0I4R

μ0I4πR

zero

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detailed solution

Correct option is B

full circular ring gives the magnetic field as μoi2Rwhile semicircular ring gives it as μoi4RMagnetic field due to straight wires if zero as the perpendicular distance of the point from the wire is zero

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