# Electrostatic question: Help needed

Discussion in 'MCAT Study Question Q&A' started by dorjiako, Aug 15, 2011.

1. ### dorjiako 2+ Year Member

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Three protons are postioned at the corners of an equilateral triangle with sides 2mm in length. What is the electric field at the center of one of the edges of the triangle? (e = 1.6 x 10 ^-19 c)?
How did the arrive at the answer 5x10 ^-4 N/C.

2. ### raffster2 2+ Year Member

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In order to arrive at this answer you need to take the components of the protons into consideration. In the middle of one edge means that two of the fields cancel each other out and you're left with the net field from the third charge. You need to find the distance between the point and the third charge using trig, then you plug that into the formula E=kq/r^2

3. OP

### dorjiako 2+ Year Member

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more help needed

4. OP

### dorjiako 2+ Year Member

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Thanks

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