Answer :
When two identical capacitors are connected to different batteries, the one connected to the higher voltage battery will have more charge.
In this case, capacitor B connected to the 6V battery will have more charge compared to capacitor A connected to the 3V battery. The presence of a dielectric in capacitor A doesn't affect the amount of charge, but rather increases its capacitance.
Dielectric constant (ϵr) is defined as the ratio of the electric permeability of the material to the electric permeability of free space (i.e., vacuum) and its value can derived from a simplified capacitor model.
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