A) \[2\sqrt{2}\times {{10}^{-6}}Nm\]
B) \[8\times {{10}^{8}}Nm\]
C) \[4\times {{10}^{-9}}Nm\]
D) \[4\times {{10}^{-7}}Nm\]
Correct Answer: D
Solution :
From the formula for torque \[\vec{\tau }=\vec{p}\times \vec{E}=pE\sin \theta \] For maximum value of torque \[\sin \theta ={{90}^{o}}=1\] Hence, \[{{\vec{\tau }}_{\max }}=pEq.2l=(2\times {{10}^{-10}}\times 1\times {{10}^{-2}})\] \[\times (2\times {{10}^{5}}\,N/C)\] \[=4\times {{10}^{-7}}\,Nm\]
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