1.

In a circuit \[L,\,C\text{  and  }R\]are connected in series with an alternating voltage source of frequency \[f\]. The current leads the voltage by 45°. The value of \[C\] is [CBSE PMT 2005]

A.            \[\frac{1}{2\pi f(2\pi fL+R)}\]
B.            \[\frac{1}{\pi f(2\pi fL+R)}\]
C.            \[\frac{1}{2\pi f(2\pi fL-R)}\] 
D.            \[\frac{1}{\pi f(2\pi fL-R)}\]
Answer» B.            \[\frac{1}{\pi f(2\pi fL+R)}\]


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