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56. (I) A parallel-plate capacitor has fixed charges+Q and -Q. The separation of the plates is then halved. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done to reduce the plate separation from d to Jd? The area of each plate is A
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cR 个d ーク g. rd 2 2 2 Ato Et ation s haluad ein 2 4Ago

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