Compute the energy necessary to bring together (from a very large distance) the

Question

Compute the energy necessary to bring together (from a very large distance) the charges q1 = 4.11microC , q2 = 4.1microC and q3 = -3.38microC in the configuration shown in the figure (Figure 1) .

Express your answer using two significant figures.

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Part B

If the distances between the particles was 20cm , what would be the energy necessary to bring them together?

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Explanation / Answer

part a)

energy required to bring together the charegs, taking 0 energy at infinty

U=kq1q2/r+kq2q3/r+kq1q3/r

where q1,q2,q3 are with their signs

part b)

U=kq1q2/r+kq2q3/r+kq3q1/r

r=0.2 m

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