A potential difference of 9.0 Volts is maintained across a 300 Ohm resistor, The

Question

A potential difference of 9.0 Volts is maintained across a 300 Ohm resistor, The total net charge passing through the resistor in 30.0s is: 0.03 C 0.90 C 9.0 C 30 C 270 C You are to design a 4.0 mu F parallel plate capacitor using a polystyrene dielectric (mu = 2.56, dielectric strength = 24 times 10^6 V/m). Suppose the capacitor must be able to withstand 1000 V without undergoing dielectric breakdown. The minimum allowable plate separation is: 4.17 times 10^-8 m 1.07 times 10^-7 m 1.56 times 10^-6 m 4.17 times 10^-5 2.56 times 10^-3 m Two parallel plate capacitors with the same plate area but different capacitance are connected in parallel to a battery. Both capacitors are filled with air. The quantity that is the same for both capacitors when they are fully charged is: the potential difference across the plates the energy density between the plates the electric field between the plates the charge on the positive plates the plate separation

Explanation / Answer

here,

8)

as the plate area is same

and the plate sepration is different

C = area * e0 /d

V = Q/C

and the electric feild , E = V/d = Q/C*d

E = Q/ ( area * e0 * d/d)

E = Q /( area * e0)

so, the electric field between the plates is same

the correct answer is C) the electric feild between the plates is same

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