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Q.

The magnetic field at the centre of an equilateral triangular loop of side 2L and carrying a current i is

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a

9μ0i4πL

b

33μ0i4πL

c

23μ0iπL

d

3μ0i4πL

answer is A.

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Detailed Solution

Magnetic field at O isB=3   μ04π  ir sin 600 + sin 600 =3 μ04π  i  3L  3=  9μ0i4πL
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