A part of a long wire carrying a current i is bent into a circle of radius r as shown in figure. The net magnetic field at the centre O of the circular loop is

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μ0i4r

μ0i2r

μ0i2πr π+1

μ0i2πr π-1

answer is C.

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Detailed Solution

The given circuit can be considered as followsBloop = μ0i2r ⊙Bconductor = μ0i2πr ⊙Bnet = μ0i2πr π +1 ⊙

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