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Q.

A regular polygon of 6 sides is formed by bending a wire of length  4π meter. If an electric current of 4π3  A is flowing through the sides of the polygon, the magnetic field at the centre of the polygon would be  x×10−7T. The value of x is ___.

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a

2

b

72

c

12

d

4

answer is A.

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Detailed Solution

Question Image

B=6μ0I4πrsin300+sin300=610−7×4π33×4π2×6=72×10−7T

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