A) \[\sqrt{3}\]
B) \[1\]
C) \[\frac{1}{\sqrt{3}}\]
D) \[\frac{1}{2}\]
Correct Answer: C
Solution :
\[{{B}_{H}}=B\cos \varphi ;\ \therefore B=\frac{{{B}_{H}}}{\cos \varphi }=\frac{0.5}{\cos {{30}^{o}}}=\frac{0.5}{\sqrt{3}/2}=\frac{1}{\sqrt{3}}\]
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