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A slab of glass dielectric is inserted into a parallel plate capacitor
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[QUOTE="kuruman, post: 6457773, member: 192687"] You have the wrong ##x##. It is not the plate separation, it is the extent to which the dielectric is inserted between the plates. The derivative is with respect to that distance. The idea is to find the capacitance as a function of ##x## and then take the derivative. I have a feeling that this might be too complicated for you and you really don't need to do it that way. You can follow plan B. Ask yourself the question, is the potential energy increasing or decreasing if you push the dielectric some more in between the plates? Then you have to relate the answer to whether the force os attractive or repulsive. I already gave you some hints about that. [/QUOTE]
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A slab of glass dielectric is inserted into a parallel plate capacitor
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