# Physics

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How much work must be done to bring three electrons from a great distance apart to within 2.1Ã—10âˆ’10 {\rm m} from one another (at the corners of an equilateral triangle)?

• Physics - ,

Let a be the separation. I do not understand your 1Ã—10âˆ’10 {\rm } notation for a

Bringing in the first electron requires no work.
Bringing in the second electron required k^e^2/a

Bringing in the third electron requires
2ke^2/a

The total work required is
3 k e^2/a

k is the Coulomb constanmt