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Question

Find the magnetic field at point O in figure

167515.PNG

A
μ0I4πa(^i+^k)
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B
μ0I4πa(^j+^k)
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C
μ0I2πa(^j+^k)
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D
μ0I22πa(^j+^k)
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Solution

The correct option is C μ0I2πa(^j+^k)
Due to wire in the x-z plane,

Magnetic field at O=μ0I4π(asin45)(sin45+sin45)^j=μ0I2πa^j

Due to wire in x-y plane,

Magnetic field at Oμ0I4π(asin45)(sin45+sin45)^k=μ0I2πa^k

Hence total magnetic field at O=μ0I2πa(^j+^k)

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