Physics - Magnetism Question with Solution | TestHub

${\mathbf{F}}_{BA}=0$, because magnetic lines are parallel to this wire. ${\mathbf{F}}_{CD}=0$, because magnetic lines are antiparallel to this wire. ${\mathbf{F}}_{CB}$ is perpendicular to paper inwards and ${\mathbf{F}}_{AD}$ is perpendicular to paper outwards. These two forces (although calculated by integration) cancel each other but produce a torque which tend to rotate the loop in clockwise direction about an axis $O{O}^{\prime }$.