A) \[3V/m\]
B) \[6V/m\]
C) \[9V/m\]
D) \[12V/m\]
Correct Answer: B
Solution :
[b] From question, \[{{B}_{0}}=20nT=20\times {{10}^{-9}}T\] (\[\because \]velocity of light in vacuum \[C=3\times {{10}^{8}}m{{s}^{-1}}\]) \[\vec{E}=\vec{B}\times \vec{C}\] \[|{{\vec{E}}_{0}}|\,=\,|\vec{B}|\cdot |\vec{C}|=20\times {{10}^{-9}}\times 3\times {{10}^{8}}=6V/m.\]
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