Question

a capacitor 8uf is charged to a potential difference of 100v. the energy stored by the capacitor is?
C = 8uF = 8*10^-6 Farads.

Energy = C*V^2/2 = (8*10^-6)*100^2/2 = __Joules.
U= 1/2 C*V^2
U= 1/2 (8*10^-6F) (100v)^2
U=0.004J

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