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energy is caused only by the change in capacitance ΔC=C f −C i =κC−C=(κ−1)C. Thus the change in energy is ΔU=0.5×3×(12×10−6) ×32=162µJ. 15. An air-filled parallel-plate capacitor has a capacitance of 2 pF. The plate separation is then doubled and a wax dielectric is inserted, completely filling the space between the plates. As a
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