In Diagram 1, a wire carries an electric current into the page and lies between the poles of a magnet. A force acts on the wire towards the bottom of the page. Diagram 2 shows what happens after the current is reversed and the magnet is rotated through $90^\circ$. In which direction does the force act after these changes?
- Atowards the top of the page
- Btowards the bottom of the page
- Ctowards the left-hand side of the page
- Dtowards the right-hand side of the page