A) 435 \[\pi \] erg
B) 2880 \[\pi \]erg
C) 1305\[\pi \] erg
D) zero
Correct Answer: B
Solution :
Work done \[W=T.\Delta A\] \[=30\times {{10}^{-5}}\times 2\times 2\pi ({{4}^{2}}-{{2}^{2}})\] \[=2880\,\pi \,\text{erg}\]
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