1.

The capacitance of a parallel platecapacitor is C when the region between the plate has air. This region is now filled with a dielectric slab of dielectric constant k. The capacitor is connected to a cell of emf E, and the slab is taken out

Answer»

charge CE(k - 1) flows through the CELL
energy `E^(2)C(k - 1)`is absorbed by the cell.
the energy stored in the capacitor is reduced by `E^2C(k-1)`
the external AGENT has to do `1/(2)E^(2)C(k-1)`amount of WORK to take the slab out.

Answer :A::B::D


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