Question

Two point-charges of 1.0 C and -0.25 uC are placed
in air at a distance of 0.40 m from each other. Find
out at which point on the line joining the two charges
should a third charge be placed so that no force acts
upon it?
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Answer 1

Answer:

take a point one side will become x and other will become 0.40-x then equate both forces