A) \[5\,N{{m}^{2}}{{C}^{-1}}\]
B) \[10\,N{{m}^{2}}{{C}^{-1}}\]
C) \[15\,N{{m}^{2}}{{C}^{-1}}\]
D) \[20\,N{{m}^{2}}{{C}^{-1}}\]
Correct Answer: D
Solution :
Given \[E=(2i+3j+k)N{{C}^{-1}}\] and \[S=10\,i\,{{m}^{2}}\] We know that \[\text{o }\!\!|\!\!\text{ =}\,\text{E}\text{.S}\] \[\text{o }\!\!|\!\!\text{ =}\,\text{(2i}\,\text{+}\,\text{3j}\,\text{+}\,\text{k)}\text{.(10}\,\text{i)}\] \[\text{o }\!\!|\!\!\text{ =}\,\text{20}\,\text{N}{{\text{m}}^{2}}{{C}^{-1}}\]
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