A) \[8mC~~~~\]
B) \[\,4mC\]
C) \[8\mu C\]
D) \[\,2mC\]
Correct Answer: D
Solution :
[d] Torque, \[\vec{\tau }=\vec{p}\times \vec{E}=pE\sin \theta \] \[4=p\times 2\times {{10}^{5}}\times \sin 30{}^\circ \] \[\text{or, }p=\frac{4}{2\times {{10}^{5}}\times \sin 30{}^\circ }=4\times {{10}^{-5}}Cm\] Dipole moment, \[p=q\times l\] \[q=\frac{p}{l}=\frac{4\times {{10}^{-5}}}{0.02}=2\times {{10}^{-3}}C=2mC\]You need to login to perform this action.
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