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The shape of magnetic field around a magnet is shown by lines
Explain the diagram on the previous slide
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
A magnetic field is also created if
electric current moves through a conductor
in a diagram show the magnetic field around a straight wire
- 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
Reversing the direction of the current will
reverse the magnetic field direction
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