Exploring LC Circuits in AP Physics C

What components make up an LC circuit?

• Capacitor, inductor, and resistor

• Capacitor, inductor, and switch

• Capacitor, resistor, and switch

• Inductor, resistor, and switch

What happens to the current immediately after the switch in an LC circuit is closed?

• It remains zero

• It immediately increases

• It becomes maximum

• It reverses direction

Why does an LC circuit not reach a steady-state current?

• Because the inductor prevents any current flow

• Because it oscillates in simple harmonic motion

• Due to constant charging and discharging of the capacitor

• Due to the resistance in the circuit

What is the relationship between the charge on the capacitor and the current through the inductor in an LC circuit?

• No relationship

• Directly proportional

• Inversely proportional

• Maximum charge corresponds to zero current

What does the equation q(t) = Qmax * cos(ωt + φ) describe in an LC circuit?

• Magnetic field in the inductor over time

• Energy in the capacitor over time

• Charge on the capacitor over time

• Current through the inductor over time

What is the significance of the phase constant φ in the simple harmonic motion equation for an LC circuit?

• It determines the maximum amplitude

• It adjusts the frequency of oscillation

• It shifts the cosine wave along the time axis

• It represents the resistance in the circuit

Tags

NGSS.HS-PS3-5

How is the maximum current in an LC circuit determined?

• By the initial charge on the capacitor only

• By the resistance in the circuit

• By multiplying the maximum charge with the square root of the product of inductance and capacitance

• By dividing the maximum charge by the square root of the product of inductance and capacitance

What does the total energy in an LC circuit depend on?

• The resistance of the circuit

• The maximum charge on the capacitor

• The phase constant of the motion

• The type of inductor used

In the graphical representation of an LC circuit, what does the purple line represent?

• The energy in the capacitor

• The energy in the inductor

• The maximum current through the inductor

• The total energy in the circuit

Tags

NGSS.HS-PS3-5

How does the energy distribution between the capacitor and inductor change over time in an LC circuit?

• It remains constant throughout

• It oscillates between the capacitor and inductor

• It is only stored in the capacitor

• It is only stored in the inductor

Tags

NGSS.HS-PS3-5