Shortcut Methods

Shortcut Methods and Tricks for LC Oscillations


JEE Mains

1. Resonance Formula

f0=12πLC

Where:

  • f0 is the resonant frequency in Hz
  • L is the inductance in Henry
  • C is the capacitance in Farads

2. Time Period Formula

T0=2πLC1

Where:

  • T0 is the time period in seconds
  • L is the inductance in Henry
  • C is the capacitance in Farads

3. Energy Storage Formula

The total energy stored in an LC circuit at any instant is given by:

E=12LI2+12CV2

Where:

  • E is the total energy stored in Joules
  • L is the inductance in Henry
  • I is the current in Amperes
  • C is the capacitance in Farads
  • V is the voltage in Volts

4. Quality Factor (Q) Formula

The quality factor (Q) of an LC circuit is a measure of its efficiency. It is given by:

Q=ωLR

Where:

  • Q is the quality factor
  • ω is the angular frequency
  • L is the inductance in Henries
  • R is the resistance in Ohms

CBSE Boards

1. Resonance Formula

f0=12πLC

Where:

  • f0 is the resonant frequency in Hertz
  • L is the inductance in Henry
  • C is the capacitance in Farads

2. Time Period Formula

T0=1f0

Where:

  • T0 is the time period in seconds
  • f0 is the resonant frequency in Hertz

3. Energy Storage Formula

E=12CV2

Where:

  • E is the energy stored in Joules
  • C is the capacitance in Farads
  • V is the voltage across the capacitor in Volts

4. Quality Factor (Q) Formula

Q=1RLC

Where:

  • Q is the quality factor
  • R is the resistance of the inductor in ohms
  • L is the inductance of the inductor in Henries
  • C is the capacitance of the capacitor in Farads