P25_038 - 38. The electric potential energy is U = k i=j =...

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38. The electric potential energy is U = k X i 6 = j q i q j r ij = 1 4 πε 0 d µ q 1 q 2 + q 1 q 3 + q 2 q 4 + q 3 q 4 + q 1 q 4 2 + q 2 q 3 2 = ³ 8 . 99 × 10 9 N · m 2 C 2 ´ 1 . 3m · (12)( 24) + (12)(31) + ( 24)(17) + (31)(17)
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