Please enable JavaScript.
Coggle requires JavaScript to display documents.
P7 - End of Topic - Coggle Diagram
P7 - End of Topic
L1 - Magnets
Metals that can be magnetised include iron, steel, nickel and cobalt.
-
The size of a magnetic force depends on:
- The distance between two magnets.
- The strength of the magnets.
- The iron content of each magnet.
-
L3 - Electromagnets
-
When a current flows through a conducting wire, a magnetic field will be generated. The direction of this field can be found using the right hand rule.
One way to increase the strength of an induced magnet (wire) is to coil the wire, this shape is known as a solenoid. The direction of this magnetic field can be found using the right hand rule where the thumb points towards the north.
We can increase the strength of a solenoid by:
- Increasing the current
- Increasing the number of turns
- Placing an iron core in the solenoid
-
L2 - Magnetic Fields
-
We can deduce that the Earth has its own magnetic field as compasses will point North-South if held away from any magnets.
L5 - The Motor Effect
A wire perpendicular to a magnetic field with a current flowing through it will experience a force; the direction of this force is determinable using Fleming's Left Hand Rule.
A motor makes use of a split ring commutator and conducting brushes to achieve a full 360 degree rotation.
-
-