In defining electric field due to a point charge, the test charge, the test charge has to be vanishingly small. How this condition can be justified, when we know that charge less than of electron or a proton is not possible.

In defining electric field due to a point charge, the test charge, the

1.	In defining electric field due to a point charge, the test charge, the test charge has to be vanishingly small. How this condition can be justified, when we know that charge less than of electron or a proton is not possible.
Answer» This is true that charge less than electron or proton is not possible but in macrosopic situations, source charge is much larger than charge on electron or proton, so the limit `q_(0) rarr 0` for the test charge is justified.

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In defining electric field due to a point charge, the test charge, the test charge has to be vanishingly small. How this condition can be justified, when we know that charge less than of electron or a proton is not possible.

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