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  1. AP Physics C E M
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What is inductance (L)?

The proportionality constant between magnetic flux and current, measured in Henries (H). ΦB=LI\Phi_B = LIΦB​=LI

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What is inductance (L)?

The proportionality constant between magnetic flux and current, measured in Henries (H). ΦB=LI\Phi_B = LIΦB​=LI

What is an inductor?

A coil of wire that resists changes in current and stores energy in a magnetic field.

Define magnetic flux (ΦB\Phi_BΦB​).

A measure of the amount of magnetic field lines passing through a given area.

What is the time constant (τ\tauτ) in an LR circuit?

The time it takes for the current in an LR circuit to reach approximately 63.2% of its maximum value. τ=L/R\tau = L/Rτ=L/R

Define angular frequency (ω\omegaω) in an LC circuit.

The rate at which energy oscillates between the capacitor and inductor in an LC circuit. ω=1LC\omega = \frac{1}{\sqrt{LC}}ω=LC​1​

What is induced EMF?

The electromotive force generated in a circuit due to a changing magnetic field. ε=−LdIdt\varepsilon = -L \frac{dI}{dt}ε=−LdtdI​

What is an inductor?

A coil of wire that resists changes in current and stores energy in a magnetic field.

Define inductance (L).

The proportionality constant between magnetic flux and current: ΦB=LI\Phi_B = LIΦB​=LI.

What is the unit of inductance?

Henry (H)

What is induced EMF?

The voltage generated in an inductor due to a changing current, opposing the change: ε=−LdIdt\varepsilon = -L \frac{dI}{dt}ε=−LdtdI​.

Define the time constant (τ\tauτ) in an LR circuit.

The time it takes for the current in an LR circuit to reach approximately 63.2% of its maximum value: τ=LR\tau = \frac{L}{R}τ=RL​.

Define angular frequency (ω\omegaω) in an LC circuit.

The rate at which energy oscillates between the capacitor and inductor in an LC circuit: ω=1LC\omega = \frac{1}{\sqrt{LC}}ω=LC​1​.

What are the differences between an inductor and a capacitor?

Inductor: Stores energy in a magnetic field, resists changes in current. Capacitor: Stores energy in an electric field, resists changes in voltage.

What are the differences between LR and LC circuits?

LR Circuit: Contains inductor and resistor, current changes exponentially. LC Circuit: Contains inductor and capacitor, energy oscillates between them sinusoidally.

What are the differences between the energy stored in an inductor and a capacitor?

Inductor: U=12LI2U = \frac{1}{2}LI^2U=21​LI2 (magnetic field). Capacitor: U=12CV2U = \frac{1}{2}CV^2U=21​CV2 (electric field).

Compare the initial behavior of an inductor and a capacitor in a DC circuit.

Inductor: Acts like an open circuit initially. Capacitor: Acts like a short circuit initially.

Compare the final behavior of an inductor and a capacitor in a DC circuit.

Inductor: Acts like a wire (short circuit) after a long time. Capacitor: Acts like an open circuit after a long time.