(2) An electric charge is stored in a parallel-plate capacitor with capacitance C. The distance between the plates in this capacitor is tripled, keeping the electric charge unchanged. How much work is done from outside in this proc- ess? (a) 3CQ 3Q² (f) (b) 2CQ 2Q² C (e) CQ (h) Q² C (d) //co Q² 2C (e) co 드 Q² 3C
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