Question

What is test charge?

Answer 1

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.

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Answer 2

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.