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Electromagnetic Induction

Moving a conductor in a magnetic field

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We have seen that an electric current in a magnetic field produces movement.

But what if we reversed the situation? Would we get an electric current if a conductor moved in a magnetic field?

The diagram shows a sensitive voltmeter connected to a coil of wire. Part of the coil moves in a uniform magnetic field between the poles of a magnet. Observe the voltmeter closely when you do your experiments.

What do you notice when you move the coil in various directions and at different speeds?

Click on the magnet and move it in a similar way to the movement of the coil.

Moving a conductor through a magnetic field is said to 'induce' a voltage across the ends of the conductor. This voltage is called the 'induced' e.m.f.

Which of these statements about your experiment are true? (You may wish to return to the experiment to check your answers.)

The only way to make an induced e.m.f. is by moving the coil.?
If I keep the speed constant, the greatest e.m.f. is when the coil moves vertically 'cutting through' the field lines.
When I reverse the direction of movement of the coil or the magnet I reverse the direction of the induced current.
Changing the speed of the magnet has no effect on the induced e.m.f.

Click on the appropriate option.  False   True

If you wish to use the standard data without answering the questions or carrying out the practical, press , or

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