Questions

In the diagram shown below, what is the magnetic field at the point O? (straight wires have infinite length)

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μ0I2πr

μ0I2πr+μ0I4πr

μ0I4r−μ0I4πr

μ0I4r+μ0I4πr

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detailed solution

Correct option is D

The magnetic field due to different parts areB1=0B2=μ0I4r⊙B3=μ0I4πr⊙∴Bnet=B1+B2+B3=μ0I4r+μ0I4πr

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