P25 075

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75.

(a) Using Eq. 25-26, we calculate the radius r of the sphere representing the 30 Vequipotential surface:

r =

q

4πε

0

V

= 4.5 m .

(b) If the potential were a linear function of r then it would have equally spaced equipotentials, but

since V

1/r they are spaced more and more widely apart as r increases.


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