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A capacitor is charged with 9muC and has a 100V p.d. between the plates. Calculate its capacity and energy stored in it, if airis trapped between the plates. |
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Answer» SOLUTION :Data supplied, `Q=9muC =9 XX 10^(-6)C ""V=100V` Capacity, `C=Q/V=(9 xx 10^(-6))/(100)=9 xx 10^(-8)F` Energy, `U=1/2 CV^(2)=1/2 QV=1/2 Q^(2)/C` `therefore U=1/2 xx 9 xx 10^(-6) xx 100=4.5 xx 10^(-4)J` |
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