- #1
panther1
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I am studying Physics Vol2 by halliday, resnick and krane. I was attempting the coloumb force exercises..If we put one charge negative and other positive in the formula..then the force comes out to be negative but the instructor manual for the book ignores the negative charge, and take it as positive, then the force comes out as positive...what I want to ask is when do I put negative charge with the force?