Pages in this set

Page 1

Preview of page 1
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…

Page 2

Preview of page 2
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

Preview of page 3
Magnets and electricity
hear

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…

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »