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what is the difference between a point charge and a test charge?

A test charge is a positive charge of very small magnitude which gives the direction and strength of electric field in space without influencing the electric field, whereas a point charge has a finite charge only but no observable mass or size.It is a hypothetical assumption to neglect the gravitational force of attraction between the charged particles in a system of charges.

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A charge becomes point charge when the distance between the spheres are greater than the radius of the spheres

Test charge is a charge which tests the effects of source charge

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the difference is a point charge creates and electric field, and a test charge, with negligible charge is placed into an electric field to measure the electric force that acts on the test charge itself

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can u elaborate?

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