
You can use the superposition principle to combine solutionsobtained by separation of variables. For example, in Prob. 3.16 you found thepotential inside a cubical box, if five faces are grounded and the sixth is at a constant potential V0; by a six-fold superposition of the result, you could obtain thepotential inside a cube with the faces maintained at specified constant voltages V1,V2,...V6 . In this way,using Ex. 3.4 and Prob. 3.15, find the potential inside arectangular pipe with two facing sides (x=±b) at potential V0 , a third (y=a) at V1 , and the last (at y=0 ) grounded.

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