Why Is My Electric Potential Calculation Incorrect?

[supermenscher]

I have done this problem over and over and keep getting the wrong answer. What is the electric potential a distance of 3.0E-15m away from a proton.

I used V=kQ/r and got 4.8E-25 V, and it says the answer is wrong.

The second part of the question asks what is the potential energy of a system that consists of 2 protons 3.0E-15m apart.

I used V=k(1.6*10E-19)^2/r and got 7.68E-44J and webassign told me it was wrong. Can anyone help

 

[chroot]

Looks like you're just making arithmetic errors:

http://www.google.com/search?num=30...*+(1.6*10^-19+C)+/+(3.0*10^-15+m)&btnG=Search

- Warren

 

[supermenscher]

Thank you so much