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dane k, Q, q, l
szukane W[A->B]
-------------------------
W = q[Vb - Va]
Vb = kQ/l + [-kQ/2l] = kQ/2l
Va = -kQl + kQ/2l = -kQ/2l
W = q[kQ/2l - (-kQ/2l)] = kQq/l czyli odp. b)
Semper in altum...........................pozdrawiam :)