A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet, such that B is in plane of the coil. If due to a current I in the triangle, a torque acts on it, the side l of the triangle is:

A coil in the shape of an equilateral triangle of side l is suspended between the pole…

Physics · Class 12 · CBSE — Moving Charges and Magnetism

A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet, such that \(\vec{B}\) is in plane of the coil. If due to a current I in the triangle, a torque \(\vec{\tau}\) acts on it, the side l of the triangle is:

\(2\left(\frac{\tau}{\sqrt{3} B I}\right)^{1 / 2}\)
\(\frac{2}{\sqrt{3}}\left(\frac{\tau}{B I}\right)\)
\(\frac{2}{\sqrt{3}}\left(\frac{\tau}{B I}\right)^{1 / 2}\)
\(\frac{1}{\sqrt{3}}\left(\frac{\tau}{B I}\right)\)

Answer

(A) 2 ( 3 B I )^ 1 / 2

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A coil in the shape of an equilateral triangle of side l is suspended between the pole…

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