- #1
bobred
- 173
- 0
Homework Statement
Two dust particles are separated by 0.01m and of the same mass and charge, find the total potential energy
Homework Equations
[tex]E_{el}=k\frac{q_1 q_2}{r}[/tex]
[tex]E_{grav}=-G\frac{m_1 m_2}{r}[/tex]
[tex]r=0.01 m[/tex], [tex]q_1=q_2=1.1201\times10^{-18} C[/tex] [tex]m_1=m_2=13\times10^{-9} kg[/tex]
Where G and k are the gravitational and Coulomb's constant respectively.
The Attempt at a Solution
[tex]E_{el}=1.128\times10^{-24} J[/tex]
[tex]E_{grav}=-1.128\times10^{-24} J[/tex]
Not sure whether it [tex]E_{tot}=E_{el}+E_{grav}[/tex] or [tex]E_{tot}=\left|E_{el}\right|+\left|E_{grav}\right|[/tex]?