A square loop of copper wire is pulled through a region of uniform magnetic field as shown. Rank the pulling forces F_A, F_B, F_C and F_D that must be applied to keep the loop moving with constant speed \(\rm (\vec v)\):

FB = FD, FA = FC

FC > FB = FD > FA

FC > FD > FB > FA

FD > FB > FA = FC

A square loop of copper wire is pulled through a region of uniform magnetic field as shown. Rank the pulling forces FA, FB, FC and FD that must be applied to keep the loop moving with constant speed \(\rm (\vec v)\):