• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Electric charges at the corners of a square

  • Thread starter Karol
  • Start date
1,380
22
1. The problem statement, all variables and given/known data
3 point charges, q1=+2E-9[Coulomb] are placed at the corners of a square of 0.2[m] edge. what is the potential at the center.

2. Relevant equations
The potential of a point charge at distance r: $$V[Volt]=K\frac{q}{r}$$
##K=\frac{1}{4\pi\varepsilon_0}=9\times 10^9##

3. The attempt at a solution
The distance from the center to each of the corners: $$r=\frac{0.1}{\cos 45^0}=0.1414[m]$$
##V_b=9\times 10^9\frac{2\times 10^{-9}}{0.1414}\cdot 3=382[Volt]##
I am not sure but it should be 254[V]
 

ehild

Homework Helper
15,344
1,753
254 would be the potential in case of two charges, or four 1E-9 C charges at each corner. The given answer must be wrong.
 
1,380
22
Thanks, Ehild
 

Want to reply to this thread?

"Electric charges at the corners of a square" You must log in or register to reply here.

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top