Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

What do you mean by electrical resonance? An LC circuit is in a condition of resonance. If C=1.0×106F and L=0.25H, then find the frequency of oscillation of the circuit.

Answer
VerifiedVerified
520.8k+ views
like imagedislike image
Hint: LC circuit is a closed loop circuit with two elements only and those are capacitor and an inductor. It does not have resistance in the circuit. It resonates at a natural frequency. Therefore it stores electrical energy.

Complete step by step solution:
Electrical resonance: In A.C. circuit with inductor and capacitor, when the frequency of A.C is gradually changed at certain frequency, the impedance becomes minimum. This condition is called resonance and such a circuit is called a “resonant circuit”.
Circuit: A series combination of inductor of inductance L, capacitor of capacitance C connected with source of alternating e.m.f. forms a series LC circuit as shown below,

seo images

Formula of inductive reactance is,
XL=2πfL
Formula of capacitive reactance is,
XC=12πfC
At resonance, XL=XC -(1)
Put the value of capacitive reactance and inductive reactance in equation (1).
Therefore, 
2πfL=12πfC
2πf2L=12πC
Therefore,
f2=1(2π)2LC
f=12πLC
Where, C = capacitor
L = inductor
Numerical: Given data-
C=1.0×106Fand L=0.25H
We know that, frequency of oscillation of the LC circuit in resonance is given by,
f=12πLC
f=12π1×106×0.25
f=318.3Hz
Therefore, Frequency of oscillator of the LC circuit f=318.3Hz.

Note: Frequency of oscillation of the LC circuit  is dependent on capacitor and inductor only. It is independent of resistance. The frequency at which capacitive reactance and inductive reactance are same in magnitude and opposite in sign is called resonant frequency. Unit of frequency is Hz.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
calendar iconAcademic year 2025-26
language iconENGLISH
book iconUnlimited access till final school exam
tick
School Full course for CBSE students
PhysicsPhysics
ChemistryChemistry
MathsMaths
₹41,848 per year
Select and buy