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What is known as electrostatic repulsion?
A) When two positively or two negatively charged particles come closer to each other then they repel from each other
B) When two charged particles come closer to each other then repel from each other
C) When positively and negatively charged particles come closer to each other then they repel from each other
D) None

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Answer
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Hint: In this question, we have to identify that option which describes the repulsion force between two which have the same type of property. This property may be either the same pole (in magnetism) or the same charges (in electrostatic).

Complete step by step answer:
Two particles feel a repulsion force when they are having the same property.
There are two types of charges which are positive charge and negative charge.
So, when two same types of charges come closer to each other then they both feel a repulsion force.
The same can be observed from the below figure:
seo images

Hence, when two positively or two negatively charged particles come closer to each other then they repel from each other, then it is known as electrostatic repulsion.

Therefore, option (A) is correct.

Additional Information:
When the particles are electrostatically charged then they feel two types of forces- electrostatic attraction and electrostatic repulsion. In electrostatic attraction, both the charges are opposite and in electrostatic repulsion, both the charges are the same.
For example, we have two types of paper pieces. One is torn paper pieces and the other is cut papers. When we rub a comb on our hair and take it close to the torn paper pieces and cut paper pieces one by one. We observe that torn paper pieces are attracted towards the comb while the cut paper pieces are not attracted towards the comb.

Note:
In this question, we have to remember the difference between attraction force and repulsion force in electrostatics. Both types of forces have charges but in attraction force, charges are opposite while in repulsion forces, charges are the same.