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Three charges, q1 = 1 µC, q2 = 2 µC and q3 = 3 µC are placed in a line with 20 cm between
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each of them. So qat a = 0, q2 at z = 20 cm and q3 at z = 40 cm. Calculate the energy stored in the
collection of charges.
(a) -0.62 J
(b) -0.43 J
(c) +0.43 J
(d) +0.62 J

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