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28. A parallel plate condenser with a di...

28. A parallel plate condenser with a dielectric of dielectric constant K between the plates has a capacity C and is charged to a potential V volts. The condenser is then isolated. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is: (a) zero (b) }(K-1)CV2 (c) CV (K-1)/K (d) (K-1)CV2 n inculator and a certain

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