Two long straight vertical wires X and Y pass through a horizontal card, as shown in figure I below.
The current in each wire is in the upward direction. The top view of the card, seen by looking vertically downwards at the card, is shown in figure II below.
On figure II
draw four field lines to represent the pattern of the magnetic field around wire X due solely to the current in wire X,
draw an arrow to show the direction of the force on wire Y due to the magnetic field of wire X.
