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Q.

In fig, what is the magnetic field induction at point O ?

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a

μ0i4πr

b

μ0i4r+μ0i2πr

c

μ0i4r+μ0i4πr

d

μ0i4r-μ0i4πr

answer is C.

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Detailed Solution

B at O will be due to the following portions(i) vertical straight portion. This is zero.(ii) circular portion. This is given byBcircular =12μ0i2r=μ0i4r(iii) straight horizontal portion. This is given byBstraight =μ0i4πr∴ BTotal =μ0i4r+μ0i4πr

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