A) \[64\times {{10}^{-4}}Nm\] and \[64\times {{10}^{-4}}J\]
B) \[32\times {{10}^{-4}}\]Nm and \[32\times {{10}^{-4}}J\]
C) \[64\times {{10}^{-4}}Nm\] and \[32\times {{10}^{-4}}J\]
D) \[32\times {{10}^{-4}}Nm\] and \[64\times {{10}^{-4}}J\]
Correct Answer: D
Solution :
Dipole moment \[p=\text{4}\times \text{1}{{0}^{\text{8}}}~\times \text{2}\times \text{1}{{0}^{\text{4}}}=\text{ 8}\times \text{1}{{0}^{\text{12}}}m\] Maximum torque \[=pE=\text{8}\times \text{1}{{0}^{\text{12}}}\times \text{4}\times \text{1}{{0}^{\text{8}}}\] \[=\text{ 32}\times \text{1}{{0}^{\text{4}}}Nm\] Work done in rotating through \[\text{18}{{0}^{\text{o}}}=\text{ 2}pE\] \[=\text{ 2}\times \text{32}\times \text{1}{{0}^{\text{4}}}=\text{ 64}\times \text{1}{{0}^{\text{4}}}J\]You need to login to perform this action.
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