The diagram depicts a coil of insulated wire wound around a soft-iron rod. As shown, the wire is linked to a d.c. power supply. The apparatus is situated in a region that is completely screened from the Earth's magnetic field. A small compass needle is positioned at point P. In which direction does the N pole of the compass needle point?
- Atowards the bottom of the page
- Btowards the left of the page
- Ctowards the right of the page
- Dtowards the top of the page