Question

What is a test charge? What is its use? Please explain in detail.​

Answer 1

Explanation:

Asking for the direction of the field at a particular point is the same as asking for the direction of the force experienced by a positive test charge placed at that point. A test charge is a charge with a magnitude so small that placing it at a point has a negligible affect on the field around the point.

We take positive charge as a test charge because positive charge is higher potential and negative charge is lower potential. Therefore, influence of positive charge on other charges is greater than negative charges. We can also take negative charge but the effect will be lower.

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Answer 2

Answer:

A TEST CHARGE is a charge with magnitude so less that placing it at a point has a negligible effect on the field around the point.