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  1. AP Physics C E M
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What are the steps to determine the direction of induced current using Lenz's Law?

  1. Determine the direction of the original magnetic field. 2. Determine if the magnetic flux is increasing or decreasing. 3. The induced current creates a magnetic field that opposes the change in flux. 4. Use the right-hand rule to find the direction of the induced current.
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What are the steps to determine the direction of induced current using Lenz's Law?

  1. Determine the direction of the original magnetic field. 2. Determine if the magnetic flux is increasing or decreasing. 3. The induced current creates a magnetic field that opposes the change in flux. 4. Use the right-hand rule to find the direction of the induced current.

Describe the energy conversion process in a generator.

Mechanical energy is converted into electrical energy through electromagnetic induction.

Describe the energy storage process in an inductor.

An inductor stores energy in the form of a magnetic field when current flows through it. The energy stored is given by U=12LI2U = \frac{1}{2}LI^2U=21​LI2.

What is the effect of increasing the number of turns in a coil on its inductance?

Increasing the number of turns increases the inductance.

What is the effect of a changing magnetic field on a nearby conductor?

A changing magnetic field induces an EMF (voltage) and can cause current to flow in the conductor.

What happens when the magnetic flux through a loop increases?

An induced current is generated in the loop, creating a magnetic field that opposes the increase in flux.

What is the effect of increasing the resistance in an LR circuit on the time constant?

Increasing the resistance decreases the time constant, causing the current to reach its maximum value faster.

What causes a magnetic field according to Maxwell's equations?

A magnetic field is created by both electric currents and changing electric fields.

Define Electromagnetic Induction.

The process of generating electricity using a changing magnetic field.

What is Magnetic Flux (PhiBPhi_BPhiB​)?

The amount of magnetic field passing through a given area, calculated as ΦB=BcdotAcdotcos(θ)\Phi_B = B cdot A cdot cos(\theta)ΦB​=BcdotAcdotcos(θ).

Define Inductance (L).

A measure of how much a coil resists changes in current, measured in henries (H).

What is the Time Constant (τ\tauτ) in an LR circuit?

A measure of how quickly the current in an LR circuit reaches its steady-state value, calculated as τ=LR\tau = \frac{L}{R}τ=RL​.

Define Faraday's Law.

A changing magnetic field induces an electromotive force (EMF), with the magnitude of the EMF proportional to the rate of change of magnetic flux: E=−NdΦBdt\mathcal{E} = -N \frac{d\Phi_B}{dt}E=−NdtdΦB​​.

What is Lenz's Law?

The direction of the induced current opposes the change in magnetic flux that caused it.