A) \[0.2\times {{10}^{-3}}Nm\]
B) \[1\times {{10}^{-3}}Nm\]
C) \[2\times {{10}^{-3}}Nm\]
D) \[4\times {{10}^{-3}}Nm\]
Correct Answer: C
Solution :
(c) \[2\times {{10}^{-3}}Nm\] The maximum torque on the dipole in an external electric field is given by \[\tau =pE=q\left( 2a \right)\times E\] Here, \[q=1\,\mu C={{10}^{-6}}C,\,2a=2\,cm=2\times {{10}^{-2}}m,\] \[E={{10}^{5}}\,N{{C}^{-1}},\,\tau =?\] \[\therefore \,\,\,\tau ={{10}^{-6}}\times 2\times {{10}^{-2}}\times {{10}^{5}}\] \[=2\times {{10}^{-3}}Nm\]
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