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Figure shows an equilateral triangle ABC of side l carrying currents as shown, and placed in a uniform magnetic field B perpendicular to the plane of triangle. The magnitude of magnetic force on the triangle is

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Bil

2Bil

3 iB

zero

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detailed solution

Correct option is A

The equivalent figure can be redrawn as shown in figure.Force on AB = ilB, Force on BCA = 2ilB in opposite direction to that on BA.Hence, net forc e = 2ilB - ilB = ilB

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