P25 071

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71. The charges are equidistant from the point where we are evaluating the potential – which is computed

using Eq. 25-27 (or its integral equivalent). Eq. 25-27 implicitlyassumes V

0 as r → ∞. Thus, we

have

V =

1

4πε

0

+Q

R

+

1

4πε

0

2Q

R

+

1

4πε

0

+3Q

R

which simplifies to Q/2πε

0

R.


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