A parallel plate condenser with a dielectric constant \( K \) betwe...

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A parallel plate condenser with a dielectric constant \( K \) between the plates has a capacity \( C \) and
P is charged to a potential \( V \) volt. The dielectric slab

W is slowly removed from, between the plates and then reinserted. The net work done by the system in this process is
(a) zero
(b) \( \frac{1}{2}(K-1) C V^{2} \)
(c) \( \frac{C V^{2}(K-1)}{K} \)
(d) \( (K-1) C V^{2} \)
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