An electrical circuit consists of a resistor R Ohm, inductor H Henry and capacitor C Farad which are connected in series. A voltage with frequency f…

An electrical circuit consists of a resistor R Ohm, inductor H Henry and capacitor C Farad which are connected in series. A voltage with frequency f is applied. Which relation is true during resonance?

1. ক) f² = 1/(4πLC)
2. খ) f² = 1/(2πLC)
3. গ) f = 1/√(LC)
4. ঘ) f = 1/(2π√(LC))