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[" 15.A bar magnet is held perpendicular...

[" 15.A bar magnet is held perpendicular to a uniform magnetic "],[" field.If the couple acting on the magnet is to be halved by "],[" field.If the couple acting on the magnet it is to be rotated is "],[" rotating it,then the angle by which it is to be rotated is "],[[" (a) "30^(@)," thr "45^(@)],[" (c) "60^(@)," (d) "90^(@)]]

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