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INTRODUCTION
• Electromagnetic oscillations refer to the repetitive back-and-forth
movement of electric and magnetic fields.
HISTORY
• 19th century when James Clerk Maxwell formulated his
electromagnetic theory.
• 1880s, Heinrich Hertz confirmed the maxwells theory.
SYSTEMS :
The three major systems used to produce the electromegnatic oscialltion are
here ;
Alternarting currents in LC circuit
Antenas
Electronic devices
LC CIRCUIT :
The circuit consisting of inductor and capacitor in series is
called LC circuit .
LC CIRCUIT
APPLICATIONS;
Wireless Communication
Mobile Phones
Microwaves
Remote Controls:
Wireless charging
Medical application
FORMULAS
.
Expression for oscillating charge in LC circuit
Current in LC
Angular frequency
Energy stored in LC circuit
is :
Total energy
.
GRAPHS ;
NUMERICAL#01
An LC circuit contains a 20 mH inductor and a 25 μ F
capacitor with an initial charge of 5 mC. The total energy
stored in the circuit initially is
Solution:
Formula:
U=Q²m/2C
Answer:0.5J
Numerical #02
The self-inductance and capacitance of an LC circuit are 0.20 mH and 5.0 pF.
What is the angular frequency at which the circuit oscillates?
Solution ;
Formula;
Free & Forced Oscillations
.
Free Oscillations:
• Oscillations in the absence of external force. Or oscillates with its natural frequency without
interference of external force.
• Only restoring force acts i.e. Fx ≠ 0 .
Natural Frequency :
• The frequency with which system oscillates in the absence of external forces is called natural
frequency of system.
MAJOR POINTS:
• Free oscillations always exist in Ideal system .
• Amplitude remains constant.
e.g
Simple pendulum when displaced from its mean position performing free oscillations.
Forced oscillations:
.
• Oscillations in the presence of some external forces.
• External forces may be damping force or periodic force .
e.g simple pendulum by applying external force.
guitar
floor
MAJOR POINTS:
• Forced oscillations exists in Real systems .
• Its amplitude doesn't remain constant .
• Energy also doesn’t remain constant.
Damped Oscillations:
• Oscillations whose amplitude decreases with time is called damped
oscillations .
e.g shock absorber
Resonance:
.
• When natural frequency of system becomes equal to frequency of applied force ,it is called
resonance.
• Its amplitude increases and energy is absorbed .
THANKS

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EMT group 10 ppt.pptx

  • 1. INTRODUCTION • Electromagnetic oscillations refer to the repetitive back-and-forth movement of electric and magnetic fields. HISTORY • 19th century when James Clerk Maxwell formulated his electromagnetic theory. • 1880s, Heinrich Hertz confirmed the maxwells theory.
  • 2. SYSTEMS : The three major systems used to produce the electromegnatic oscialltion are here ; Alternarting currents in LC circuit Antenas Electronic devices LC CIRCUIT : The circuit consisting of inductor and capacitor in series is called LC circuit .
  • 3. LC CIRCUIT APPLICATIONS; Wireless Communication Mobile Phones Microwaves Remote Controls: Wireless charging Medical application
  • 4. FORMULAS . Expression for oscillating charge in LC circuit Current in LC Angular frequency
  • 5. Energy stored in LC circuit is : Total energy . GRAPHS ;
  • 6.
  • 7. NUMERICAL#01 An LC circuit contains a 20 mH inductor and a 25 μ F capacitor with an initial charge of 5 mC. The total energy stored in the circuit initially is Solution: Formula: U=Q²m/2C Answer:0.5J
  • 8. Numerical #02 The self-inductance and capacitance of an LC circuit are 0.20 mH and 5.0 pF. What is the angular frequency at which the circuit oscillates? Solution ; Formula;
  • 9. Free & Forced Oscillations . Free Oscillations: • Oscillations in the absence of external force. Or oscillates with its natural frequency without interference of external force. • Only restoring force acts i.e. Fx ≠ 0 . Natural Frequency : • The frequency with which system oscillates in the absence of external forces is called natural frequency of system. MAJOR POINTS: • Free oscillations always exist in Ideal system . • Amplitude remains constant. e.g Simple pendulum when displaced from its mean position performing free oscillations.
  • 10. Forced oscillations: . • Oscillations in the presence of some external forces. • External forces may be damping force or periodic force . e.g simple pendulum by applying external force. guitar floor MAJOR POINTS: • Forced oscillations exists in Real systems . • Its amplitude doesn't remain constant . • Energy also doesn’t remain constant. Damped Oscillations: • Oscillations whose amplitude decreases with time is called damped oscillations . e.g shock absorber
  • 11. Resonance: . • When natural frequency of system becomes equal to frequency of applied force ,it is called resonance. • Its amplitude increases and energy is absorbed .