Magnetic fields
This practical lesson covers:
- How to determine the shape and direction of the magnetic field around a bar magnet
Investigation into the shape of a magnetic field around a bar magnet Aim: To determine the shape of the magnetic field around a bar magnet. |
Background information: A magnetic field is a region around a magnet where magnetic forces are exerted. The field lines visually represent these fields, showing the directional path from a magnet's north pole to its south pole. In this practical, you will investigate the shape of magnetic fields using two methods to determine the shape of the magnetic field around a bar magnet: iron filings and a plotting compass. |
Why does the student tap the paper once iron filings have been sprinkled?
to align the iron filings with the magnetic field lines
to make the magnet repel the iron filings
to make the magnet attract the iron filings
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The direction of magnetic field lines is always..
south to north
50% each way
north to south
completely random
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Why is the magnet placed under the paper for the iron filings method?
to stop the iron filings sticking to the magnet
so the magnet isn't in the way
to stop the iron filings repelling the magnet
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The student observes that the magnetic field lines are closest together..
along the edges of the magnet
at the poles
at the furthest point from the magnet
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In which direction will the plotting compass needle point?
the needle will point to the side of the magnet
the north pole of the compass needle will point to the north pole of the magnet
the north pole of the compass needle will point to the south pole of the magnet
the needle will spin randomly
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