Electric Field on Central Axis

[McAfee]

Homework Statement

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.

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.

 

[SammyS]

Homework Statement

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.

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.

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

 

[McAfee]

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

E-fields point away from positive charges.

So the answer has to be B?

 

[SammyS]

E-fields point away from positive charges.

So the answer has to be B?

Yup !

 

[asteriatic]

The electric field on the central axis through a ring of uniform positive charge would be pointing away from the ring on both sides. This is because the electric field lines are always directed away from positive charges. Additionally, the electric field on the central axis would be uniform since the ring has a uniform charge distribution.