Lecture on Magnetism and Electromagnetism

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

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15 Terms

1
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What do like poles do in magnetism?

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

2
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What happens to opposite poles in magnetism?

Opposite poles attract each other.

3
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What materials are typically magnetic?

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

4
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What are permanent magnets?

Permanent magnets are always magnetic and always have poles.

5
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What are induced magnets?

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

6
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How does stroking a magnet create a temporary magnet?

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

7
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What is the direction of magnetic field lines?

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

8
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What happens to magnetic field strength with distance?

Field strength decreases with distance from the magnet.

9
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What is Earth's magnetic field alignment related to?

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

10
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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.

11
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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.

12
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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.

13
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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.

14
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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.

15
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What is the effect of current size on magnetic field strength?

Greater current produces a stronger magnetic field.