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

Work done per unit charge by electric field on charge

  • Thread starter Cicicicici
  • Start date
  • #1
15
0

Homework Statement


Screen Shot 2018-05-25 at 2.37.17 pm.png


Homework Equations




The Attempt at a Solution


I know the units for V is J/C so #3 and #4 are wrong. But how do I determine the signs?
 

Attachments

Answers and Replies

  • #2
kuruman
Science Advisor
Homework Helper
Insights Author
Gold Member
8,730
2,136
Is the work done by the electric field positive or negative? What do you need to ascertain in order to answer this question? Hint: When is the work done by a force positive and when is it negative?
 
  • #3
15
0
Is the work done by the electric field positive or negative? What do you need to ascertain in order to answer this question? Hint: When is the work done by a force positive and when is it negative?
Work is positive when force is in same direction as displacement. So here the direction is X to Y and the force is also from X to Y because Vx>Vy?
 
  • #4
kuruman
Science Advisor
Homework Helper
Insights Author
Gold Member
8,730
2,136
Work is positive when force is in same direction as displacement. So here the direction is X to Y and the force is also from X to Y because Vx>Vy?
Yes, electric field lines point from a region of high potential to a region of low potential. Since the charge is positive, the electric force on it is in the same direction as the electric field.
 
  • #5
15
0
Yes, electric field lines point from a region of high potential to a region of low potential. Since the charge is positive, the electric force on it is in the same direction as the electric field.
Thank you!!!
 

Related Threads on Work done per unit charge by electric field on charge

Replies
2
Views
1K
Replies
8
Views
1K
Replies
5
Views
1K
Replies
4
Views
784
Replies
6
Views
2K
  • Last Post
Replies
9
Views
1K
  • Last Post
Replies
2
Views
1K
Replies
5
Views
1K
  • Last Post
Replies
0
Views
1K
Top