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[" 37.A magnetic needle suspended parall...

[" 37.A magnetic needle suspended parallel to a magnetic field "],[" requires "sqrt(3)J" of work to turn it through "6(0)/(2)" .The torque "],[" needed to maintain the needle in this position will be "],[[" (a) "2sqrt(3)J," (b) "3J],[" (c) "sqrt(3)J," (d) "(3)/(2)J]]

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