Here's the question: "How much work must be done to bring three electrons from a great distance apart to within 1.0 x 10^-10 m from each other?"(adsbygoogle = window.adsbygoogle || []).push({});

Here's what I did :

.(work to bring one to another)

Work = PE + KE

= PE + 0

=q(V final - V initial) ; V initial = 0

=qV final

=q(KQ/r)

= (1.6 x 10^-19)((9 x 10^9 x 1.6 x 10^-19)/(1.0 x 10^-10))

= 2.3 x 10^-18 J

.(work to bring the other one)

Work = q(KQ/r)

= (1.6 x 10^-19)((9 x 10^9 x 1.6 x 10^-19)/(2 x 1.0 x 10^-10))

= 1.2 x 10^-18 J

. I then add them together to get the total work done

(2.3 x 10^-18 J) + (1.2 x 10^-18 J)

= 3.4 x 10^-18 J

Now, is that right? Feel free to correct me.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electric Potential/Energy question

**Physics Forums | Science Articles, Homework Help, Discussion**