Electromagnetism, Properties Of Waves, Motion, Gases & The Kinetic Theory Worksheet With Answers Page 2
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36The Motor Effect
We can use the magnetic effect of electricity
to produce movement.
Permanent magnet
If a current-carrying wire is placed in the
N
magnetic field of a permanent magnet, two
magnetic fields will exist on top of each other
Magnetic field
– one due to the permanent magnet, and one
downwards
from the electricity flowing in the wire.
S
This produces a force on the wire, in exactly
the same way a force is produced between two
magnets placed close together.
Current into
wire
The size of the force on the wire can be increased by doing one of three things :
1. Increasing the current
2. Increasing the magnetic field strength
3. Increasing the number of wires in the field
The force produced on a wire can be used to create
movement (rotational), and is known as the ‘Motor Effect’.
It’s possible to predict the direction of the force by using Fleming’s LEFT hand
rule.
If the thumb and first two fingers of the left hand
are placed at right angles to each other as shown
then . . . .
the First finger is in the direction of the Field
the seCond finger is in the direction of the Current
and the thuMb is in the direction of Motion.
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