## direction of electric field

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jmalemulje
Posts: 2
Joined: Tue Sep 04, 2018 2:53 pm

### direction of electric field

A negatively charged particle moving at constant speed from right to left enters a region of space where a uniform electric field exists (see figure). Once the particle enters the field, it slows, momentarily stops, and then moves back out of the field from left to right along the same initial path. What is the direction of the electric field?

I take the initial velocity to be towards the left and the final towards the right for negative particle. Using the equation F = q E shows that force and electric field are opposite for negative particles. The force is to the right since it gets pushed that way. What I get is that the electric field is to the left.

Is this alright ?

jeff
Posts: 38
Joined: Mon Mar 05, 2018 11:54 pm

### Re: direction of electric field

Hi jmalemulje,
jmalemulje wrote:
Tue Sep 04, 2018 2:54 pm
A negatively charged particle moving at constant speed from right to left enters a region of space where a uniform electric field exists (see figure). Once the particle enters the field, it slows, momentarily stops, and then moves back out of the field from left to right along the same initial path. What is the direction of the electric field?

I take the initial velocity to be towards the left and the final towards the right for negative particle. Using the equation F = q E shows that force and electric field are opposite for negative particles. The force is to the right since it gets pushed that way. What I get is that the electric field is to the left.

Is this alright ?
Yes, that's all correct!

jmalemulje
Posts: 2
Joined: Tue Sep 04, 2018 2:53 pm

### Re: direction of electric field

Thanks for checking it out.