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 :
(d) \[4\times {{10}^{-7}}\,Nm\] Here, \[q=2\times {{10}^{-10}}C,\,x=1\,cm=0.01m\] Dipole moment = Charge x Distance \[=2\times {{10}^{-10}}\times {{10}^{-2}}=2\times {{10}^{-12}}cm\] Maximum Torque = \[pE\] \[=2\times {{10}^{-12}}\times 2\times {{10}^{5}}=4\times {{10}^{-7}}Nm\]
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