A) \[0.250\,N{{m}^{-1}}\]
B) \[0.125\text{ }N{{m}^{-1}}\]
C) \[0.2\text{ }N{{m}^{-1}}\]
D) \[8.0\text{ }N{{m}^{-1}}\]
Correct Answer: B
Solution :
\[W=2({{A}_{f}}-{{A}_{I}})T\] \[\Rightarrow \,T=\frac{W}{({{A}_{f}}-{{A}_{i}})\times 2}\] \[\frac{3\times {{10}^{-4}}J}{2[5\times 4\times {{10}^{-4}}-4\times 2\times {{10}^{-4}}]}\] \[=0.125\,N{{m}^{-1}}\]
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