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
  • A$ir\overrightarrow B $
  • B$2\pi ri\overrightarrow B $
  • C
    Zero
  • D$\pi ri\overrightarrow B $
IIT 1983, Easy
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