2 Problems involving electric field and work

  • Thread starter nutella
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  • #1
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Homework Statement


Excuse my excellent paint skills
http://imgur.com/PbXdlOW
If the work done by a charge from z to y is W. Would the work be different if it was from z to x then to y.

Homework Equations


W=vQ

The Attempt at a Solution


I said it would be the same because delta v would be the same in the end

1. The problem state, all variables and give/known data
http://imgur.com/RkG05ph

What is the electric field at the point z and what is the direction

Homework Equations


E=kq/r^2

The Attempt at a Solution


I assume the positive and negative would cancel each other out. The distance between the charge and the center is d rad(2)/2 so the charge for one of them would be KQ/(2d^2/4)= 2KQ/d^2 then you just multiply that by 2 because there is two charges, but i don't know the direction
 

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Answers and Replies

  • #2
DrClaude
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The fact that you don't know the direction in the last problem is an indication that you did something wrong. Can you justify
I assume the positive and negative would cancel each other out.
 
  • #3
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My teacher showed us a problem where the opposite corners were opposite charges and he said the electric field at the middle is zero.
 
  • #4
DrClaude
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What happens if you put a test charge in the middle?
 

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