Suppose we have two rectangular plates with a width of .060 and a length of 5.5m

Question

Suppose we have two rectangular plates with a width of .060 and a length of 5.5m that comprise a parallel plate capacitor. If the space between the plates is filled with air (k=1) and the plates are .0020mm apart, what is their capacitance? If the capacitor is connected to a 12 V battery, what is the energy stored in the capacitor? Suppose we have two rectangular plates with a width of .060 and a length of 5.5m that comprise a parallel plate capacitor. If the space between the plates is filled with air (k=1) and the plates are .0020mm apart, what is their capacitance? If the capacitor is connected to a 12 V battery, what is the energy stored in the capacitor?

Explanation / Answer

area=0.06*5.5=0.33m2

d=0.002/1000m

c=E0ErA/d=8.85 x 10-12 F/m *1*0.33/(0.002/1000)=1.46x10-6F

E=(1/2)CV2=1/5*1.46x10-6*122=1.0512x10-4J

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