A circular loop of radius r having N number of turns 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 :

Options

A. (A) `NIpir^(2)B`
B. (B) `N^2I^(2)pir^(2)B`
C. (C) `NI^(2)pir^(2)B`
D. (D) `NIpir^(2)B^(2)`

Answer

C