First slide

Phasors and Phasor Diagrams

Question

A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency n. If the resonant frequency is n_r, then the current lags behind voltage when

Moderate

A

n = 0
B

$n < n_{r}$
C

$n = n_{r}$
D

$n > n_{r}$

Solution

The current will lag behind the voltage when reactance of inductance is more than the reactance of condenser.
Thus, $ωL > \frac{1}{ωC} or ω > \frac{1}{\sqrt{LC}}$
$or n > \frac{1}{2 π \sqrt{LC}} or n > n_{r}$ where n_r = resonant frequency

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App