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 the plane of the coil. If due to a current \(i\) in the triangle, a torque \(\tau\) acts on it, the side \(l\) of the triangle will be:
1. \(\frac{2}{\sqrt{3}} \left(\frac{\tau}{Bi}\right)\)
2. \(\frac{1}{\sqrt{3}} \frac{\tau}{Bi}\)
3. \(2 \left(\frac{\tau}{\sqrt{3} Bi} \right)^{\frac{1}{2}}\)
4. \(\frac{2}{\sqrt{3}} \left(\frac{\tau}{Bi} \right)^{\frac{1}{2}}\)
Subtopic:  Current Carrying Loop: Force & Torque |
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