Electricity and potential energy

AI Thread Summary
The electric potential at a point midway between two charges of 5.21 nC and -2.24 nC, separated by 29.6 cm, is calculated to be 180.36 V. For the potential energy of the pair of charges, the formula used is k*q1*q2/d, where k is the Coulomb's constant (8.98755 x 10^9 N*m^2/C^2) and d is the distance between the charges. It is clarified that d should not be squared in this calculation. The potential energy will be expressed in units of N*m. This discussion focuses on the calculations related to electric potential and potential energy in a system of point charges.
wadini
Messages
47
Reaction score
0
Two point charges of magnitude 5.21 nC and -2.24 nC are separated by 29.6 cm. The columb content is 8.98755*10 ^9 N*m^2/C^2. What is the electric potential at a point midway between the charges? Answer in untis of V

I got the answer for this part= 180.36 V

The second part of the question asks what is the potential energy of the pair of charges? Answer in units of N*m. That is where I am confused
 
Physics news on Phys.org
Potential energy of the system = k*q1*q2/d
 
Last edited:
I don't think you square d. I think it is just d. It doesn't make sense if I want to get it in units of N*m
 
Yes. You are right.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

Electric Potential Energy of Point Charge Systems
Replies
2
Views
941
Why does electric potential energy increase if you move against the field?
Replies
6
Views
1K
Minimizing the Energy of Two Conductors Very Far Apart
Replies
23
Views
2K
Potential difference in between positive and negative charge
Replies
13
Views
2K
Potential and Electric Field near a Charged CD Disk
Replies
2
Views
2K
Why Is Work Positive When Done Against the Electric Field?
Replies
22
Views
3K
How do I calculate the potential created by a dipole
Replies
2
Views
2K
Hooke's Law using Potential Energy
Replies
21
Views
1K
Uniform charge density and electric potential
Replies
4
Views
3K
Charge on a grounded conducting sphere in a uniform electric field, after ungrounding and movement
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top