If the moving charges composing the currents are positive, in which direction are

they deflected by the magnetic field? What about if they are negative? $($Recall

that if the charges are negative, they flow in the opposite direction of the

current$).$ This deflection results in an accumulation of charge at opposite sides of

the bar, which in turn produces an electric force to counteract the magnetic one.

Equilibrium ensues when the two forces exactly cancel