Homework Help: Electric potantial

1. Jan 28, 2007

gazepdapi1

I need you guys to check some of my answers for the following problem, which has 7 different cases. Each case has to be answered by stating the direction of the test charge with the electric field and whether the electric potantial decreases from point a to b. Below are two sample pictures of what I'm describing.

http://img256.imageshack.us/img256/6502/qqug4.jpg" [Broken]

here are the different scenarios:

plus charge emitting a field line to the right, point a to b, where a is closser to the charge. test charge is moving towards the plus charge
-I said test charge goes against E, and P. increases

same E field, negative test charge moves away from the plus charge
-I said negative test charge moves along E, and P. decreases

same E field, negative test charge moves toward plus charge
-I said negative test charge moves against E, P. increases

now there is a negative charge emmiting a field line coming from the right toward itself. test charge moves away from the E field
-I said test charge moves against E, P. increases

same E field, test charge moves toward E field.
-I said test charge move along E, P. decreases

same E field, negative test charge moves away from the E filed.
-I said negative test charge goes against E, P. increases

same E field, negative test charge moves toward E field
-I said negative test charge goes along E, P. increases

I hope thats clear
thanks a lot guys

Last edited by a moderator: May 2, 2017
2. Jan 28, 2007

mjsd

what about +ve test charge moving away from the +ve source charge?

3. Jan 28, 2007

gazepdapi1

The professor used that as an example, so i don't need it.
good eye though

4. Jan 28, 2007

gazepdapi1

can anyone tell me if these are correct or not please?