A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is $\overrightarrow F$ the net force on the remaining three arms of  the loop is
  • A$3$$\overrightarrow {F} $
  • B$-$$\;\overrightarrow {\;F} $
  • C$-3$$\overrightarrow {\;F} $
  • D$\overrightarrow {\;F} $
AIPMT 2010, Medium
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