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2. In exploring the electric field with a test charge, we have often assumed for convenience that test charge was positive. Does this really make any difference in determining electric field?​

Sagot :

Explanation:

A test charge certainly does affect the electrical field.

But if you’re talking about the concept of Potentials, then read carefully: they’re talking about imaginary test-charges which have infinitesimal charge.

Any real test-charge will have a significant effect on the e-field being tested.

However, if we keep making our test-charge smaller and smaller, the effect will grow less and less. Therefore just make our test-charge almost zero, but not exactly zero. Let its charge become infinitely close to zero. Then it will have an infinitesimal e-field of its own, which doesn’t alter the e-fields being measured.

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