A) 60°
B) 45°
C) 30°
D) 0°
Correct Answer: A
Solution :
\[{{B}_{H}}=0.3\ Oersted,\ \ I=0.6\ Oersted\] We have \[{{B}_{H}}=I\cos \varphi \Rightarrow \cos \varphi =\frac{{{B}_{H}}}{I}=\frac{0.3}{0.6}=\frac{1}{2}\] \[\therefore \ \varphi ={{60}^{o}}\]
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