A) 2 J
B) 1 J
C) 3 J
D) 30 kJ
सही उत्तर: C
$ w=\frac{1}{2}mV^{2}( 1+\frac{K^{2}}{r^{2}} ) $
$ =\frac{1}{2}\times 100{{(20\times {10^{-2}})}^{2}}( 1+\frac{1}{2} ) $
$ =\frac{4}{3}\times \frac{3}{2}=3J $
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