NEET Physics Moving Charges and Magnetism Questions Solved

In the following figure a wire bent in the form of a regular polygon of n sides is inscribed in a circle of radius a. Net magnetic field at centre will be


(a) μoi2πatanπn                                                (b) μ0ni2πatanπn

(c)2πniaμ0tanπn                                             (d) ni2aμ0tanπn

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