1- A capacitor consists of two closely spaced metal conductors of large area, se

Question

1-A capacitor consists of two closely spaced metal conductors of large area, separated by a thin insulating foil. It has an electrical capacity of 4000.0 ?F and is charged to a potential difference of 84.0 V. Calculate the amount of energy stored in the capacitor.

2-Calculate the charge on this capacitor when the electrical energy stored in the capacitor is 8.71 J.

3-If the two plates of the capacitor have their separation increased by a factor of 5 while the charge on the plates remains constant, by what factor is the energy stored in the capacitor increased?

Explanation / Answer

1)U=0.5CV2=14.1J

2)U=Q2/2C

Q=sqrt(2UC)=sqrt(2*8.71*4000*10-6)=0.264C

3)The capacitance decreases by a facotr of 5.

Therefore the energy stored becomes 5 times or it increases by a factor of 4.

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