Two parallel pltate capacitors A and B have the same separation `d=8.85xx10^(-4)m` between the plates. The plate areas of A and B are `0.04m^(2)` and `0.02 m^(2)`, respectively. A slab of dielectric constant (relative permittivity) `K=9` has dimensions such that it can exactly fill the space between the plates of capacitor B.
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i. The dielectric slab placed insid A as shown in. A is then charge to a potential difference of `110 V. Calculate the capacitance of A and the energy stored in it.
ii. The battery is disconnected, and then the dielectric slab is removed from A Find the work done by the extergy agency in removing the slab from A.
iii. The same dielectric slab is now placed inside B, filling it completely. The two capcitors `A and B` are then connected as shown in. `(c )`. Calculate the energy stored in the system.

Answer

`(i) 2n F, 12.1 mu J, " " (ii) 48.4 mu J, " " (iii) 11muJ`