Wednesday, September 14, 2011

A 13.0 capacitor is connected to a power supply that keeps a constant potential difference of 24.0?

A 13.0 capacitor is connected to a power supply that keeps a constant potential difference of 24.0 across the plates. A piece of material having a dielectric constant of 3.75 is placed between the plates, completely filling the space between them

a)How much energy is stored in the capacitor before the dielectric is inserted?

b)How much energy is stored in the capacitor after the dielectric is inserted?

c)By how much did the energy change during the insertion?A 13.0 capacitor is connected to a power supply that keeps a constant potential difference of 24.0?
Hello Mish, what about the units of values given? 13 is that micro or pico or nano? 23 is that V or milli volt or micro volt?

ANy way let me give the formula.

Energy = 1/2 C V^2

a) you plug the values with proper units and solve yourself.

b) as dielectric is inserted the capacitance increases by 3.75 times. Hence the energy also gets increased by 3.75 times.

c) Hence the energy change during insertion is 3.75-1 = 2.75 times the original.

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