Compare $LC$ oscillations and forced damped oscillations in mechanics.
(N/A) The equation of motion for a forced damped mechanical oscillator is given by:
$m \frac{d^{2} x}{d t^{2}} + b \frac{d x}{d t} + k x = F_{0} \cos \omega_{d} t$
The equation for a driven $LCR$ circuit is given by:
$L \frac{d^{2} q}{d t^{2}} + R \frac{d q}{d t} + \frac{q}{C} = V_{m} \sin \omega t$
By comparing these two differential equations, we can establish an analogy between mechanical and electrical systems as follows:
$m \frac{d^{2} x}{d t^{2}} + b \frac{d x}{d t} + k x = F_{0} \cos \omega_{d} t$
The equation for a driven $LCR$ circuit is given by:
$L \frac{d^{2} q}{d t^{2}} + R \frac{d q}{d t} + \frac{q}{C} = V_{m} \sin \omega t$
By comparing these two differential equations, we can establish an analogy between mechanical and electrical systems as follows:
| Mechanical System (Forced Oscillations) | Electrical System (Driven $LCR$ Circuit) |
| Displacement $x$ | Charge $q$ |
| Mass $m$ | Inductance $L$ |
| Damping constant $b$ | Resistance $R$ |
| Spring constant $k$ | Inverse capacitance $1/C$ |
| Driving force $F_{0} \cos \omega_{d} t$ | Driving voltage $V_{m} \sin \omega t$ |
| Natural frequency $\omega_{0} = \sqrt{k/m}$ | Natural frequency $\omega_{0} = 1/\sqrt{LC}$ |
Explore More
Similar Questions
$A$ condenser of capacity $6 \ \mu F$ is fully charged using a $6 \ V$ battery. The battery is removed and a resistanceless $0.2 \ mH$ inductor is connected across the condenser. The current flowing through the inductor when one-third of the total energy is in the magnetic field of the inductor is.....$A$
Difficult
View Solution$A$ capacitor of capacity $C$ is charged to a potential difference of $V_1$. The plates of the capacitor are then connected to an ideal inductor of inductance $L$. The current through the inductor when the potential difference across the capacitor reduces to $V_2$ is
DifficultAIPMT 2010
View SolutionAn $LC$ circuit contains a $20 \; mH$ inductor and a $50 \; \mu F$ capacitor with an initial charge of $10 \; mC$. The resistance of the circuit is negligible. Let the instant the circuit is closed be $t=0$.
$(a)$ What is the total energy stored initially? Is it conserved during $LC$ oscillations?
$(b)$ What is the natural frequency of the circuit?
$(c)$ At what time is the energy stored $(i)$ completely electrical (i.e.,stored in the capacitor)? $(ii)$ completely magnetic (i.e.,stored in the inductor)?
$(d)$ At what times is the total energy shared equally between the inductor and the capacitor?
$(e)$ If a resistor is inserted in the circuit,how much energy is eventually dissipated as heat?
$(a)$ What is the total energy stored initially? Is it conserved during $LC$ oscillations?
$(b)$ What is the natural frequency of the circuit?
$(c)$ At what time is the energy stored $(i)$ completely electrical (i.e.,stored in the capacitor)? $(ii)$ completely magnetic (i.e.,stored in the inductor)?
$(d)$ At what times is the total energy shared equally between the inductor and the capacitor?
$(e)$ If a resistor is inserted in the circuit,how much energy is eventually dissipated as heat?
Medium
View Solution$A$ capacitor of capacitance $C$ is charged to a potential difference $V_0$. Now,this capacitor is connected to an ideal inductor. When $25\%$ of the energy of the capacitor is transferred to the inductor,what will be the potential difference across the capacitor?
Medium
View SolutionObtain the differential equation for an $LC$ circuit.
Easy
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo