A) \[4\times {{10}^{4}}J\]
B) \[~1.2\times {{10}^{5}}J\]
C) \[2.4\times {{10}^{5}}J\]
D) None of these
Correct Answer: B
Solution :
Work done = area of trapezium \[=\frac{1}{2}\times (8\times {{10}^{5}}+4\times {{10}^{5}})\times 0.2\] \[=1.2\times {{10}^{5}}J\]
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