In Figure, the straight wire $AB$ is fixed while the loop $PQRS$ is free to move under the influence of the electric currents flowing in them. In which direction does the loop begin to move ? Give reason for your answer.

Write the expression for the magnetic moment $\left(\overrightarrow{m}\right)$ due to a planar square loop of side $\text{'}l\text{'}$ carrying a steady current $I$ in a vector form. As shown in Figure, this
loop is placed in a horizontal plane near a long straight conductor carrying a steady current $I_1$ at a distance $l$. Give reasons to explain that the loop will experience a net force but no torque. Write the expression for this force acting on the loop.