question_answer

A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to the one of the sides of the loop and is in the plane of the loop. If a steady current I is established in wire as shown in figure, the loop will [IIT 1985; MP PET 1995; MP PMT 1995, 99; AIIMS 2003]

A)            Rotate about an axis parallel to the wire

B)            Move away from the wire or towards right

C)            Move towards the wire

D)            Remain stationary

Correct Answer: C

Solution :

                   \[\because \,{{r}_{1}}<{{r}_{2}}\] So  F1 > F2                    \[\Rightarrow {{F}_{net}}=({{F}_{1}}-{{F}_{2}})\]            towards the wire.