- #1

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I know what formula you need to solve this problem (the attachment), but I'm having trouble with understanding the signs and direction of points A,B, and C.

I know that the lines go towards the negative and away from the positive, but I'm still not seeing the correct signs.

For instance I know that the charge on the charge density 1 near point A is negative and so the field lines go towards the left, which is way the charge density of 1 is negative.

Let's say for point B, for example, the charge density of 3 is going towards the left, so in my mind it should be negative and the charge density of 2 is going towards the right, so it should be positive, but I looked on the answer sheet and it's the other way around. I'm not understanding this.

I know that the lines go towards the negative and away from the positive, but I'm still not seeing the correct signs.

For instance I know that the charge on the charge density 1 near point A is negative and so the field lines go towards the left, which is way the charge density of 1 is negative.

Let's say for point B, for example, the charge density of 3 is going towards the left, so in my mind it should be negative and the charge density of 2 is going towards the right, so it should be positive, but I looked on the answer sheet and it's the other way around. I'm not understanding this.