Physics

Arrows on the diagram point away from north and towards south to show the direction of the magnetic field . The closer the lines are the stronger the magnet is . The magnetic field can be seen by placing the magnet under a piece of paper with small iron filings on top . The filings line up in the shape of the field . The direction of the arrows can be seen by placing a compass in the field

electric current moves through a conductor

• the magnetic field around a straight wire is circular , at right angles to the wire .
• the magnetic field around a straight wire isn't very strong

reverse the magnetic field direction