Part A Constants A 12.5 F capacitor is connected to a power supply that keeps a

Question

Part A Constants A 12.5 F capacitor is connected to a power supply that keeps a constant potential difference of 26.0 V 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. How much energy is stored in the capacitor before the dielectric is inserted? Submit XIncorrect; Try Again; 3 attempts remaining Part B How much energy is stored in the capacitor after the dielectric is inserted? U2 = Submit Request Answer Part C By how much did the energy change during the insertion? AU =

Explanation / Answer

a) Energy before Dielectric = 0.5CV^2

= 0.5*12.5*10^-6*26^2

= 0.004225 J

b) energy after insterting the dielectric = 0.5kCV^2

= 3.75*0.004225 = 0.0158 J

c) energy change during the insertion = 0.0158 - 0.004225 = 0.01162 J

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