Question

A series ac circuit consist of an inductor and a capacitor. The inductance and capacitance is respectively 1 henry and $25\mu F.$ If the current is maximum in circuit then angular frequency will be

• A. 200
• B. 100
• C. 50
• D. 200/2$\pi$

Answer 1

Answer: (A)

200

Answer 2

Current in LC circuit becomes maximum when resonance occurs. So

$\omega = \frac{1}{\sqrt{LC}} = \frac{1}{\sqrt{1 \times 25 \times 10^{- 6}}} = \frac{1000}{5} = 200rad/\sec$