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A circular loop of radius r having N nu...

A circular loop of radius r having N number of tunrns carries current I is placed in a placed in a uniform magnetic field`vecB` parallel to the plane of the loop.The torque on the loop is : (A) `NIpir^(2)B` (B) `N^(2)Ipir^(2)B` (C) `NI^(2)pir^(2)B` (D) `NIpir^(2)B^(2)`

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