A parallel-plate capacitor has capacitance 3.50 A parallel-plate capacitor has c

Question

A parallel-plate capacitor has capacitance 3.50

A parallel-plate capacitor has capacitance 3.50 mu F. How much energy is stored in the capacitor if it is connected to a 9.00 V battery? Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. muJ If the battery is disconnected and the distance between the charged plates doubled, what is the energy stored? The battery is subsequently reattached to the capacitor, but the plate separation remains as in part (b). How much energy is stored?

Explanation / Answer

0.5*C*V^2=141.75 uJ

b)distance doubled==> caapcitance halved

charge remains the same.

energy=q^2/(2*C)

so as capacitance is halved,energy is doubled.

so energy=283.5 uJ

c)70.875 uJ

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