A) \[{{0}^{o}}\]
B) \[{{30}^{o}}\]
C) \[{{60}^{o}}\]
D) \[{{90}^{o}}\]
Correct Answer: A
Solution :
When \[\theta ={{0}^{o}}\], \[\cos \theta \]is maximum. So, \[W\] is maximum at\[\theta ={{0}^{o}}\]
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