A) 3.5 N
B) 7.5 \[\pi \] \[\times {{10}^{-3}}N\]
C) 15 \[\pi \] \[\times {{10}^{-3}}N\]
D) none of these
Correct Answer: B
Solution :
Using the relation, \[F=TL=T\times 2\pi R\] Here, \[R=5cm=5\times {{10}^{-2}}m\] \[T=75\times {{10}^{-3}}N/m\] or \[F=75\times {{10}^{-3}}\times 2\times \pi \times 5\times {{10}^{-2}}\] So, \[F=7.5\pi \times {{10}^{-3}}N\]You need to login to perform this action.
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