LC Circuit Concepts and Relationships

The video explains the LC oscillator tank circuit, which consists of a capacitor and an inductor. It describes how energy is transferred between these components, creating oscillations. The video covers the dynamics of magnetic fields as current changes, the reversal of polarity, and the flow of conventional current. It also discusses the decay of oscillations due to energy loss through resistance and the need for feedback to maintain oscillations.

What are the two main components of an LC oscillator tank circuit?

• Resistor and Capacitor

• Capacitor and Inductor

• Inductor and Resistor

• Transistor and Capacitor

What happens to the magnetic field in the inductor as the current increases?

• It reverses direction

• It remains constant

• It collapses

• It expands

What happens to the energy stored in the capacitor when it is fully discharged?

• It is transferred to the inductor

• It is lost as heat

• It remains in the capacitor

• It is converted to light

What is the relationship between the magnetic field strength and the current in the inductor?

• Inversely proportional

• Directly proportional

• Unrelated

• Exponentially related

When the magnetic field in the inductor collapses, what happens to the polarity across the inductor?

• It becomes zero

• It remains the same

• It reverses

• It doubles

In the LC circuit, what is the direction of conventional current flow?

• From negative to positive

• From positive to negative

• In both directions simultaneously

• It does not flow

What is the effect of resistance on the oscillations in an LC circuit?

• It decreases the amplitude over time

• It has no effect

• It increases the amplitude

• It reverses the oscillations

What is the primary reason for the decrease in oscillation amplitude over time in an LC circuit?

• Increase in inductance

• Decrease in capacitance

• Energy loss through resistance

• Increase in frequency

How can the oscillations in an LC circuit be maintained over time?

• By using a larger inductor

• By increasing resistance

• By applying external energy periodically

• By removing the capacitor

What is necessary to introduce in an LC circuit to ensure continuous oscillations?

• A feedback mechanism

• A larger capacitor

• A smaller inductor

• A higher resistance