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[" A bar magnet is hung by a thin cotton...

[" A bar magnet is hung by a thin cotton thread in "],[" a uniform horizontal magnetic field and is in "],[" equilibrium state.The energy required to rotate "],[" it by "60^(@)" is "W" .Now the torque required to keep "],[" the magnet in this new position is "],[[" (a) "(W)/(sqrt(3))," (b) "sqrt(3)W],[" (c) "(sqrt(3)W)/(2)," (d) "(2W)/(sqrt(3))]]

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