Energy Stored by Capacitor Video Lessons

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Problem: A parallel-plate air capacitor has a capacitance of 920 pF. The charge on each plate is 3.90 μC. Part AWhat is the potential difference between the plates? Express your answer with the appropriate units. Part B If the charge is kept constant, what will be the potential difference between the plates if the separation is doubled? Express your answer with the appropriate units. Part C How much work is required to double the separation? Express your answer with the appropriate units (mJ)

FREE Expert Solution

The charge stored in a capacitor:

Q=CV

Energy stored in a capacitor:

U=12CV2=12QV=Q22C

Capacitance of :

C=ε0Ad

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Problem Details

A parallel-plate air capacitor has a capacitance of 920 pF. The charge on each plate is 3.90 μC. 

Part A

What is the potential difference between the plates? Express your answer with the appropriate units. 

Part B 

If the charge is kept constant, what will be the potential difference between the plates if the separation is doubled? Express your answer with the appropriate units. 

Part C 

How much work is required to double the separation? Express your answer with the appropriate units (mJ)

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