A square loop is placed near a long straight current carrying wire as shown in figure. If the loop is moved away from the wire.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Wire will exert net attractive force on the loop
Magnetic field at distance $r$ from the long straight wire: $B=\frac{\mu_0 i}{2\pi r}$.
As the loop is moved away, $B$ through the loop decreases. By Lenz's law the induced current produces a field to oppose this decrease, hence induced current is clockwise (viewed from front) so as to produce $B$ into the page.
Left (near) side current is upward (parallel to wire current) → attraction. Right (far) side current is downward (antiparallel) → repulsion, but weaker because $B$ is smaller there.
Net force on the loop is attractive.