The magnetic field lines around a bar magnet originate from the north pole and curve around to enter the south pole. These lines represent the direction of magnetic force and never intersect.
Below is the diagram: 
Two identical circular loops \(P\) and \(Q\) each of radius \(r\) are lying in parallel planes such that they have common axis. The current through \(P\) and \(Q\) are \(I\) and \(4I\) respectively in clockwise direction as seen from \(O\). The net magnetic field at \(O\) is: 
Find magnetic field at midpoint O. Rings have radius $R$ and direction of current is in opposite sense. 