A) 2 J
B) 1 J
C) 3 J
D) 30 kJ
Correct Answer: C
Solution :
| [c] \[w=\frac{1}{2}m{{V}^{2}}\left( 1+\frac{{{K}^{2}}}{{{r}^{2}}} \right)\] |
| \[=\frac{1}{2}\times 100{{(20\times {{10}^{-2}})}^{2}}\left( 1+\frac{1}{2} \right)\] |
| \[=\frac{4}{3}\times \frac{3}{2}=3J\] |
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