AQA GCSE The Motor Effect(Physics)
The Motor Effect
The motor effect occurs when a current carrying wire is placed into a magnetic field and the wire experiences a force and tries to move.
This is shown in the diagram below.
When the green current carrying wire is placed into an external magnetic field, it will experience a downwards force.
Factors that affect the size of the force include:
1. Strength of the magnet, the stronger the magnetic field, the greater the force.
(Be careful not to write about size of the magnet).
2. Size of current, the larger the current flowing through the wire, the greater the force
3. The wire experience a maximum force when it is perpendicular (90 degrees) to the field lines as current flowing through wire will cut the magnetic field lines.
Wire experiences no force when the wire is parallel with field lines because current flowing through the wire will not cut the magnetic field lines.
Changing direction of the force
The direction of force on the wire is reversed if either of these events occur:
1.Direction of current is reversed
2. Magnetic field reverses direction
If both are reversed at the same time, then the two effects cancel out and the direction of the force will not change.
We can use Fleming’s left hand rule to predict the direction of the force, but this will be covered on a separate page of notes.
Uses for the motor effect
The motor effect is used in devices that use a motor such as washing machine, tumble dryer. It is also used in loudspeakers.
We will study loudspeakers later on a separate page of notes.
Practice Question
1.Describe what the motor effect is.
2. State two factors that affect the size of the force, experienced by the wire
3. A motor effect experiment is carried out using a direct current and then with an alternating current. Describe what you would see.
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