Electromagnetic Induction and Faraday's Law

These flashcards cover key concepts related to Faraday's Law, Lenz's Law, and electromagnetic induction as discussed in the lecture.

What happens to the galvanometer's needle when the battery is connected to the wire?

The needle moves when the battery is connected and again moves in the opposite direction when it is disconnected.

According to Faraday's Law, how is induced EMF related to the magnetic flux?

The induced EMF is equal to the negative rate of change of magnetic flux through a loop.

What is Lenz's Law?

Lenz's Law states that the direction of the induced current will oppose the change in magnetic flux that produced it.

What is the formula for induced EMF according to Faraday's Law?

Induced EMF = -N (dΦ/dt) where N is the number of loops and Φ is the magnetic flux.

What are three ways to change magnetic flux according to the notes?

Change the magnetic field strength, change the area of the loop, or change the orientation angle between the field and the loop.

What does the term 'magnetic flux' refer to?

Magnetic flux quantifies how many magnetic field lines pass through a given area.

How does the speed of moving magnets affect the induced current?

The faster the magnets move in and out of the coil, the greater the induced current.

What does induction require?

Induction requires a transient change in the magnetic field.

What role does the galvanometer play in Faraday's experiment?

The galvanometer measures the induced current created by the changing magnetic field.

How can a simple coil of wire generate voltage according to the notes?

By rotating it in a magnetic field or changing the magnetic field around it.

What is the significance of the minus sign in Faraday's Law?

It indicates that the induced EMF acts in opposition to the change in magnetic flux.

In the context of Lenz's Law, what does a decreasing magnetic flux induce?

It induces a current that creates a magnetic field in the same direction as the applied magnetic field.

What does the induced current direction depend on?

The direction depends on whether the magnetic flux is increasing or decreasing.

What is the effect of a uniform magnetic field on a current-carrying loop?

In a uniform magnetic field, the net force on the loop is zero if the loop is not changing.

What type of device utilizes the principles of electromagnetic induction to generate electricity?

A generator, which transforms mechanical energy into electrical energy.