Direction of the electric field

  • Thread starter soopo
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  • #1
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Homework Statement


The problem is as an attachment.


The Attempt at a Solution



The right answer is (a).
However, I do not understand why.

I draw two circles around the A and B. I let A's electric field go to anticlockwise direction, while that of B to clockwise direction.

I got the result that electric field points from D to C.
However, my answer is wrong.
 

Attachments

  • particlePhysics.JPG
    particlePhysics.JPG
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  • coordinateSystemPhysics.JPG
    coordinateSystemPhysics.JPG
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Answers and Replies

  • #2
dx
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What do you mean anticlockwise and clockwise? The electrostatic field of a point charge points radially. If the charge is positive, it points outward radially. If the charge is negative, it points inward radially. The magnitude is proportional to q/r².
 
  • #3
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What do you mean anticlockwise and clockwise? The electrostatic field of a point charge points radially. If the charge is positive, it points outward radially. If the charge is negative, it points inward radially. The magnitude is proportional to q/r².

Thank you for your answer!

I got finally that the electric field is from A to B.
I had confused electric field apparently with Magnetic field.

The key in allowing me to understand the problem was to set a positive test mass between two charges.
 

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