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