A charge Q is placed on the plates of a parallel-plate capacitor. The plate spacing is then

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A charge ±Q is placed on the plates of a parallel-plate capacitor. The plate spacing is then increased from L to 2L. 

(a) By what factor does the electric potential energy stored in this capacitor change? 

(b) Energy must be conserved, so where did this extra energy come from (or go to)?

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