Q6. See page 154 and read the article ENERGY IN THE ELECTRIC FIELD IN A DIELECTRIC. From expression you get energy density inversely proportional to r-4.
Q7. Charge on the plates does not depend upon their area. This is because overall charge on capacitor is always zero and so positive or negative charge cannot be in excess.
Q9. The capacitor C2 has high potential and thus can store more charge ( Q V ). As it stores more charge, thus it has more capacitance. Thus C2 > C1.
Q6. See page 154 and read the article ENERGY IN THE ELECTRIC FIELD IN A DIELECTRIC. From expression you get energy density inversely proportional to r4.
Q7. Charge on the plates does not depend upon their area. This is because overall charge on capacitor is always zero and so positive or negative charge cannot be in excess.
Q9. The capacitor C2 has high potential and thus can store more charge ( Q V ). As it stores more charge, thus it has more capacitance. Thus C2 > C1.
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V ). As it stores more charge, thus it has more capacitance. Thus C2 > C1.
