20 points
q1 and q2 can be negative. The force is the same as if they were positive because -1 x -1 = 1
4 points
In this case yes, but if q1 was -20μC, q2 was 30μC, and r was 0.5m, then using -20μC as it is would make F equal to -21.6N which is just 21.6N of attraction force between the two charges.
5 points
If they are oppositely charged particles, I would expect that there is a force of attraction acting on them, yes.
I am not saying that’s wrong, just that there’s 21.6N of attraction force between the two charges not -21.6N.
0 points
*
But that if both are negative not one pos one neg like the previous commenter gave in their examples, so the true formula has an absolute value in the numerator: |q1Xq2|
1 point
