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[" A long wire hangs vertically with its...

[" A long wire hangs vertically with its upper end clamped.A torque of "8Nm" applied to "],[" the free end twists it through "45^(0)" .The potential energy of the twisted wire is "],[[" 1) "pi,J]],[" 2) "(pi)/(2)J],[" 3) "(pi)/(4)J],[" 4) "(pi)/(8)J]

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