|
Permanent
magnet
|
Electromagnet
|
|
The strength of permanent magnet is
fixed.
|
The strength of electromagnet can be
varied by changing current through the coil.
|
|
Its
polarities are fixed.
|
Its polarities
can be changed by changing the direction of current through it.
|
|
They are made of alloys
|
It is nothing but copper coil wound on
iron rod and connecting it to battery.
|
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