Editor
Energy required to charge a capacitor of \rm{5 \,\mu F} by connecting DC source of 20 kV is
Difficulty: Easy
A: 
$\rm{1\, kJ}$
B: 
$\rm{2\, kJ}$
C: 
$ \rm{5\, kJ}$
D: 
$ \rm{10\, kJ}$
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