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ch24_p23 - 23(a All the charge is the same distance R from...

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23. (a) All the charge is the same distance R from C , so the electric potential at C is (in SI units) 9 12 1 1 1 2 0 0 6 5 1 5(8.99 10 )(4.20 10 ) 2.30 V, 4 4 8.20 10 Q Q Q V R R R ε ε × × ª º = = − = − = − « » × ¬ ¼ π π where the zero was taken to be at infinity. (b) All the charge is the same distance from P . That distance is
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