A circular coil of wire carries a current. $PQ$ is a part of a very long wire carrying a current and passing close to the circular coil. If the directions of currents are those shown in figure, what is the direction of force acting on $PQ$ ?
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There is a circular coil which is a dipole placed in a non uniform magnetic field due to $PQ.$ Now magnetic field due to circular coil will be out of the plane and not uniform. Therefore, force which will act on $PQ$ will have direction, $F=\overrightarrow{d l} \times \vec{B}$
since $\overrightarrow{d l}$ is vertically downwards and $\vec{B}$ is out of the plane therefore, direction of $\vec{F}$ will be towards left that is perpendicular to the $PQ$. or right angled with $PQ.$
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