# Electric Field on Central Axis

1. Feb 18, 2012

### McAfee

1. The problem statement, all variables and given/known data

Which describes the electric field on the central axis through a ring of uniform positive charge?

A. The field vectors point along the axis and toward the ring on both sides of the ring.
B. The field vectors point along the axis and away from the ring on both sides of the ring.
C. The field vectors point along the axis and away from the ring on one side of the ring and toward the ring on the opposite side.

3. The attempt at a solution

I have ruled out option C because it doesn't make sense. So I'm stuck between option A and B.

I would guess that the answer is B.

2. Feb 18, 2012

### SammyS

Staff Emeritus
Do E-field lines tend to point toward positive charge, or away from positive charge?

3. Feb 18, 2012

### McAfee

E-fields point away from positive charges.

So the answer has to be B?

4. Feb 18, 2012

### SammyS

Staff Emeritus
Yup !

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook