A rectangular loop $A B C D$ carrying a current $I$ is situated near a straight conductor $X Y$, suc

Question

A rectangular loop $A B C D$ carrying a current $I$ is situated near a straight conductor $X Y$, such that the conductor is parallel to the side $A B$ of the loop and is in the plane of the loop. If a steady current $I$ is established in the conductor as shown, the conductor $X Y$ will\ \

Professor PC Thomas Classes · Answer

(b) : The current in the straight conductor $X Y$ and side $A B$ of the rectangular loop are in the same direction, hence, will attract each other. Side CD of the rectangular loop and the conductor $X Y$ have current in the opposite direction, hence, will repel each other. But CD is farther from the conductor $X Y$ compared to $A B$, so net force will be attractive. Thus, conductor will move towards the side $A B$ of the loop.