A current carrying closed loop in the form of a right angle isosceles triangle $ABC$ is placed in a uniform magnetic field acting along $AB.$ If the magnetic force on the arm $BC$ is $\vec F,$ the force on the arm $AC$ is
  • A$ - \sqrt 2 \vec F$
  • B$-$ $\vec F$
  • C$\vec F$
  • D$\sqrt 2 \vec F$
AIPMT 2011, Medium
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