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Magnets and electricity
Magnetic field around a solenoid or electromagnet
Right Hand Grip Rule (to find which is the North
pole of a solenoid or electromagnet)
-Right hand
-Fingers go in direction of conventional current (positive
to negative)
-Thumb points North

Domain theory
- Magnetically hard material becomes permanently magnetised…

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Magnets and electricity
The motor effect
Wire with a current passing through it is put in a magnetic field experiences a force (unless its field
is parallel to the field which its in) which causes it to move = the motor effect. Occurs because the
field around the current-carrying wire…

Page 3

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Magnets and electricity

Electric motor
- One side of loop of charged wire is pushed
up whilst the other is moved down rotation
- Commutators and brushes current
changes direction when loop is vertical

In practical motors
-Very strong electromagnets used instead of
permanent magnets
-Several coils on same…


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