Objects 1 and 2 attract each other with an electrostatic force of 18 units. if the charge of object 2 is increased by a factor of 3 and the distance separating objects 1 and 2 is increased by a factor of 3, then the new electrostatic force will be units.

Explanation:

Electrostatic Force

We know particles 1 and 2 attract each other with an electrostatic force of 18 units. The force between two charged particles is given by Coulomb's formula

Where are the charges and r is the distance between them.

We are told the new charge 2 is

And the distance is three times the original

The new force is

Operating

This force is one third of the other one, so  

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