Two charges, individual charge values?

  • Thread starter Thread starter xvie
  • Start date Start date
  • Tags Tags
    Charge Charges
AI Thread Summary
The discussion revolves around calculating the individual charges of two point charges that are 3.0 cm apart, given their electric potential energy of -120 microJoules and a total charge of 30 nC. Participants suggest using the equation Uele=q1(kq/d) to solve the problem, emphasizing the importance of applying the total charge correctly. There is uncertainty about the equations provided by the professor, prompting requests for clarification. The key focus is on determining the lesser and larger charge values based on the provided information. The conversation highlights the need for a clear understanding of the relationship between electric potential energy and charge values.
xvie
Messages
1
Reaction score
0
1. Two point charges 3.0 cm apart have an electric potential energy -120 microJoules. The total charge is 30 nC. What is the lesser charge? What is the larger charge?



2. Uele=qv Uele=q1(kq/d)



3. My professor gave me these equations, I'm not entirely sure if they're the right ones. I haven't even attempted it - I just need help in figuring out how to work the problem. Thanks.
 
Physics news on Phys.org
Welcome to Physics Forums.
xvie said:
Uele=q1(kq/d)
Use that equation, and the values given in the problem statement. You'll have to think about how the statement "the total charge is 30 nC" can be applied here.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Find electric field a distance P from a charged rod
Replies
7
Views
2K
Finding the value of the electric charge
Replies
8
Views
3K
Method of mirroring - metal plates
Replies
11
Views
2K
Finding Equilibrium in Electric Fields of Two Charges
Replies
13
Views
3K
Potential energy of a system of two punctual charges along the X axis
Replies
7
Views
1K
Component Force on a 1.0 nC Charge
Replies
2
Views
10K
How Does Charge Distribute Between Two Concentric Shells Connected by a Wire?
Replies
2
Views
2K
Find the Y component of Electric field at a point
Replies
35
Views
4K
Electric field with three charges and a point
Replies
1
Views
3K
Coulomb's law and two point charges question
Replies
8
Views
6K

Hot Threads

Recent Insights

Back
Top