Energy Stored by Capacitor Video Lessons

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Problem: Suppose a parallel plate capacitor (with capacitance C0) is fully charged (to a value Q0) by a battery. The battery (which supplies a potential difference of V0) stays connected to the capacitor. If the plates of the capacitor are then moved closer together (the separation distance d between the plates is halved), describe quantitatively what happens to: a) the capacitance of the capacitor. b) the potential difference between the plates. c) the energy stored in the capacitor. d) the charge on the plates. 

FREE Expert Solution

(a) Capacitance:

C = ε0A/d

New capacitance:

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Problem Details

Suppose a parallel plate capacitor (with capacitance C0) is fully charged (to a value Q0) by a battery. The battery (which supplies a potential difference of V0) stays connected to the capacitor. If the plates of the capacitor are then moved closer together (the separation distance d between the plates is halved), describe quantitatively what happens to: 

a) the capacitance of the capacitor. 

b) the potential difference between the plates. 

c) the energy stored in the capacitor. 

d) the charge on the plates. 

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