A) \[12\times {{10}^{-1}}N-m\]
B) \[12\times {{10}^{-2}}N-m\]
C) \[12\times {{10}^{-3}}N-m\]
D) \[12\times {{10}^{-4}}N-m\]
Correct Answer: C
Solution :
[c] Charger (q) \[=2\times {{10}^{-6}}C,\] Distance [d]\[=3cm=3\times {{10}^{-2}}m\] and electric field (E) \[=2\times {{10}^{5}}N/C.\] Torque \[\left( \tau \right)=q.d.\] \[E=\left( 2\times {{10}^{-6}} \right)\times \left( 3\times {{10}^{-2}} \right)\times \left( 2\times {{10}^{5}} \right)\] \[=12\times {{10}^{-3}}N-m.\]
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