In the figure, what is the magnetic field at the point O?

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μ0I4πr

μ0I4πr+ μ0I2πr

μ0I4r+ μ0I4πr

μ0I4r- μ0I4πr

answer is C.

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Detailed Solution

Magnetic field due to different parts areB1=0B2= μ04π. πIr ⊙B3= μ04π. Ir ⊙∴ Bnet = B2 +B3 = μ0I4r +μ0I4πr

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