what is the difference between a point charge and a test charge?
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Answer:
A test charge is positive charge of very small magnitude which give the direction and strength of electric fielding space without influencing the electric field, whereas point charge has a finite charge only but no observable mass or size. it is hypothetical assumption to neglect the gravitational force .
Explanation:
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Answer:
Test charge and point charge are synonymous in the sense that both are unit positive charge. However, conceptually, a point charge is the one with dimensions so much smaller than the other dimensions appearing in the problem so that they can be ignored; while a test charge is the one which is used to test the effect on an electric field.
The test charge is imagined to be so small that it does not change the charge configurations causing the fields it is measuring. Generally this charge has to be small enough that it would be considered point like, but technically it is the charge that must be small, not necessarily its dimensions.
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