A) \[1.5\pi \times {{10}^{-4}}J\]
B) \[1.2\pi \times {{10}^{-4}}J\]
C) \[0.3\pi \times {{10}^{-4}}J\]
D) \[0.6\pi \times {{10}^{-4}}J\]
Correct Answer: B
Solution :
\[W=2T\Delta A\] \[=2T\times 4\pi (r_{1}^{2}-r_{2}^{2})\] \[=2\times 0.05\times 4\pi \times (4\times {{10}^{4}}-1\times {{10}^{4}})\] \[W=1.2\pi \times {{10}^{-4}}J\]You need to login to perform this action.
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