A wire carrying a current $I$ is placed inside a uniform magnetic field $\vec B=-B_0\hat k$. The shape of the wire is parabolic and has equation $Y = 2x -x^2.$ The force on the wire will be :
  • A$F = 2B_0i,$ upwards
  • B$F = 2B_0i,$ downwards
  • C$F = 4B_0i,$ upwards
  • D$F = 4B_0i,$ downwards
Diffcult
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