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Q.

A wire of uniform resistance per unit length is bent to form an equilateral triangle of side L. A current I flows into one corner and flows out of an adjacent corner, as shown. The magnetic field at the centroid of triangle due to the current in the triangular frame is

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a

$\frac{3 μ_{0} I}{2 π L}$

b

$\frac{3 \sqrt{3} μ_{0} I}{2 π L}$

c

Zero

d

$\frac{3 μ_{0} I}{π L}$

answer is D.

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A wire of uniform resistance per unit length is bent to form an equilateral triangle of side L. A current I flows into one corner and flows out of an adjacent corner, as shown. The magnetic field at the centroid of triangle due to the current in the triangular frame is