A) \[90{}^\circ \]
B) \[270{}^\circ \]
C) \[0{}^\circ \]
D) \[180{}^\circ \]
Correct Answer: D
Solution :
[d] \[b=\frac{Z{{e}^{2}}\cot \left( \frac{\theta }{2} \right)}{4\pi {{\varepsilon }_{0}}{{k}_{i}}}=0\Rightarrow \cot \left( \frac{\theta }{2} \right)=0\] \[\Rightarrow \frac{\theta }{2}=90{}^\circ \text{ or }\theta =180{}^\circ \]
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