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**1. The problem statement, all variables and given/known data**

A charged particle A exerts a force of 2.62microNewtons to the right on a charged particle B when the particles are 13.7 mm apart. Particle B moves straight away from A to make the distance between them 17.7mm. What vector force does it then exert on A?

**2. Relevant equations**

I know its easy, very, but for the love of god I can't figure this out.

**3. The attempt at a solution**

I know that they are both positive particles, so im assuming both are +1.60x10^-19c.

Also I believe we use F= (K q1 q2/r^2). Ive tried inserting different things in to the formula but none of it gives me the answer im looking for which is 1.57micronewtons