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Bringing together two charges which were initially infinetely far away to a separation of 1.0 m requires 20 J of work. Bringing the same charges

Bringing together two charges which were initially infinetely far away to a separation of 1.0 m requires 20 J of work. Bringing the same charges from infinitely far away to a separation of 0.5 m requires work of

(a) 5 J

(b) 10 J

(c) 40 J

(d) 80 J

Please show work / explain

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