Effects of force between charged objects.
When you inflate two balloons and rub them against hair or wool, they become electrically charged. They gain the same charges.
Like charges repel each other and therefore when the balloons are hanged and moved close to each other, they move apart. This is called repulsion.
After a while, the charged particles vanish gradually. The balloons are no longer charged and they move closer.
Demonstrating attraction between charged objects.
Using an empty soda aluminum can that is placed on a flat surface, rub an inflated balloon against your hair or against woolen cloth.
Hold the inflated balloon close to the soda can (without touching the can) and observe the interaction between the inflated balloon and the can.
Observation and explanation.
Rubbing the balloon against hair or wool causes negative charges to move from the hair or wool to the inflated balloon.
The balloon, therefore, becomes negatively charged.
The negative charges on the inflated balloon attracts the positive charges on a can (Aluminium can) Therefore, the can rolls towards the inflated balloon.
As you pull the balloon away from the can, the can continue to roll towards the balloon. This is called attraction.
It one object has negative charge and the other has a positive charge, the two objects attract each other. Therefore, a positive charge and a negative charge attract each other.
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