The
motor effect
•When
a current flows through a wire a magnetic field is produced around the wire.
•When
a current carrying wire is placed in a magnetic field it experiences a
force. This is called the motor effect.
•The
size of the force can be increased by:
-
increasing the strength of
the magnetic
field
- increasing the size of the current.
•The
conductor will not experience a force if it is parallel to
the magnetic field.
•The
direction of the force is reversed if
either the direction of the current or the direction of the magnetic
field is
reversed.
• We
can use Fleming’s LEFT hand rule to determine the direction
of movement, the
current or magnetic
field
Fleming’s left hand rule:
Is used to work out the direction of the
force (movement)experienced by the wire:
Applications:
•Electromagnets
are used on cranes in scrap metal yards for lifting iron/steel
•The
motor effect is used in electric motors. Electric motors are found in washing
machines, hair dryers etc…
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