A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field \[\overrightarrow{B}\], such that \[\overrightarrow{B}\] is perpendicular to the plane of the loop. The magnetic force acting on the loop is [BIT 1992; MP PET 1994; IIT 1983; MP PMT 1999; AMU (Engg.) 2000]

• A.            \[ir\overrightarrow{B}\] 
• B.            \[2\pi ri\overrightarrow{B}\]
• C.            Zero                                         
• D.            \[\pi ri\overrightarrow{B}\]