What is the electric field magnitude at points where electric potential is zero?

Click For Summary

Homework Help Overview

The problem involves determining the electric field magnitude at points on the x-axis where the electric potential is zero, given two point charges: a -14.3 nC charge and a +24.9 nC charge that are 17.4 cm apart.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between electric potential and electric field, noting that the potential is zero at certain points. There is a focus on setting up the equations correctly to find the positions where this occurs, with some questioning the assumptions made in the equations.

Discussion Status

The discussion includes attempts to clarify the setup of the equations for electric potential and electric field. One participant expresses confusion about obtaining a negative value for distance, while another suggests a different equation setup to yield two values for distance. There is a note that one participant claims to have resolved their confusion.

Contextual Notes

Participants are navigating the implications of the scalar nature of electric potential and the conditions under which it can equal zero. The problem constraints include the specific charges and their separation distance, which influence the potential and field calculations.

n_h0987
Messages
7
Reaction score
0

Homework Statement



A -14.3 nC point charge and a +24.9 nC point charge are 17.4 cm apart on the x-axis. What is the magnitude of the electric field at the two points on the x-axis where the electric potential is zero?

Homework Equations



V = kq/r
E = kq/r^2

The Attempt at a Solution



Since the potential = 0,

q1 = -14.3 nC, q2 = 24.9 nC

kq1/(r+0.174) = kq2/r

But this gives me one negative value for r, whereas I need two values.
 
Physics news on Phys.org
Electric potential is a scalar.
 
since net potential is zero then

Potential due to q1 + potential due to q2=0

means equation is

kq1/(r+0.174) + kq2/r = 0 ; {not kq1/(r+0.174) = kq2/r}this will give two values of r one negative and one positive
 
I figured it out, thank you!
 

Similar threads

  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 7 ·
Replies
7
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
5
Views
1K
  • · Replies 22 ·
Replies
22
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 23 ·
Replies
23
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
1
Views
2K