Lecture on Magnetism and Electromagnetism

These flashcards cover key concepts and facts related to magnetism and electromagnetism, as discussed in the lecture.

What do like poles do in magnetism?

Like poles repel each other (North-North, South-South).

What happens to opposite poles in magnetism?

Opposite poles attract each other.

What materials are typically magnetic?

Cobalt, Steel, Iron, and Nickel are typically magnetic materials.

What are permanent magnets?

Permanent magnets are always magnetic and always have poles.

What are induced magnets?

Induced magnets are materials that become magnetic temporarily when influenced by a permanent magnet.

How does stroking a magnet create a temporary magnet?

Stroking aligns the domains in the material, creating a temporary magnet.

What is the direction of magnetic field lines?

Magnetic field lines point from the North pole to the South pole of a magnet.

What happens to magnetic field strength with distance?

Field strength decreases with distance from the magnet.

What is Earth's magnetic field alignment related to?

A freely suspended magnetic compass aligns itself with Earth’s field lines and points North.

What does the right hand rule help determine?

The right hand rule helps determine the direction of the magnetic field around a current-carrying wire.

What increases the strength of a solenoid's magnetic field?

Having an iron core in the center of the solenoid increases its magnetic field strength.

What is Fleming’s Left Hand Rule used for?

Fleming’s Left Hand Rule is used to determine the direction of the force on a current-carrying conductor in a magnetic field.

What does the formula F = BIL represent?

It represents the force on a conductor in a magnetic field, where F is the force, B is the magnetic flux density, I is the current, and L is the length of the conductor.

What happens when a current-carrying wire is placed near a magnet?

The magnetic field produced by the current interacts with the magnet's field, exerting a force on the wire.

What is the effect of current size on magnetic field strength?

Greater current produces a stronger magnetic field.