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Charges and static electricity (Where is static electricity (When you rub…
Charges and static electricity
Where is static electricity
Plastics such as acetate and polythene, can collect a charge because they are insulators.
The charges cannot flow through the plastic into other materials.
When you rub an
acetate rod
with a dry duster some of the electrons move from the acetate to the duster.
As electrons are negative this gives the duster a negative charge
The acetate rod will then have a positive charge.
When you rub a polythene rod with a duster, electrons move from the duster onto the polythene.
polythene becomes negative
duster becomes positive
There is a force of attraction between rods with opposite charges
if they can move they will move towards each other
Rods with the same charge repel each other
Charging by induction
A charged object can affect the distribution of charges on an uncharged object
Example
if a negatively charged balloon is bought towards a wall, the negatively charged electrons in the wall are repelled
This causes the surface of the wall to become positively charged.
No charges are transferred from the ballon and
so we say
that the positive charged wall has been induced.
This is
induction
electrons are
pushed
away from the surface so the ballon and wall can attract each other.
