why do we always take unit positive test charge?

Question

while finding the electric field intensity of a charge why do we always take a unit positive test charge and not a unit negative test charge?

Answer 1

It is by convention. Taking a negative test charge introduces another negative sign into the equation, which we do not like. It is much easier to do a positive unit test charge. Really there would be no difference except an extra negative sign and a little more work.

Answer 2

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