# ch24_p80 - µ C to C cm to m we obtain ∆ U = – 24 J(b...

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8 0. The work done is equal to the change in the (total) electric potential energy U of the system, where U = q 1 q 2 4 πε o r 12 + q 3 q 2 4 πε o r 23 + q 1 q 3 4 πε o r 13 and the notation r 13 indicates the distance between q 1 and q 3 (similar definitions apply to r 12 and r 23 ). (a) We consider the difference in U where initially r 12 = b and r 23 = a , and finally r 12 = a and r 23 = b ( r 13 doesn’t change). Converting the values given in the problem to SI units
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Unformatted text preview: ( µ C to C, cm to m), we obtain ∆ U = – 24 J. (b) Now we consider the difference in U where initially r 23 = a and r 13 = a , and finally r 23 is again equal to a and r 13 is also again equal to a (and of course, r 12 doesn’t change in this case). Thus, we obtain ∆ U = 0....
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