Two point charges separated by a distance d repel each other with a force of 9n. if the separation between them becomes 3d, the force of repulsion will be?

1 N

Explanation:

According to Coulomb's law, the charge force between 2 charges is inversely proportional to their distance squared. So if you increase the separation between them by 3 folds, their charge force would drop by a factor of . So the new force would be 9 / 9 = 1N

all of the answers are correct.

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explanation:

d) physical means can be used to separate the components of air.