(adsbygoogle = window.adsbygoogle || []).push({}); electrostatics --- calculation of electric field intensity

1. The problem statement, all variables and given/known data

My aim is to calculate electric field intensity at a point P where the test charge q_{o}is kept which is at a distance r from the source charge q is kept.

2. Relevant equations

Why it has mentioned limit q_{o}tends to zero is mentioned in coulomb's law in my attached image?

3. The attempt at a solution

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Electrostatics - calculation of electric field intensity

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