Understanding Magnetism

These flashcards cover key concepts related to magnetism, including induced magnetism, properties of magnetic fields, and observations of Earth's magnetic field.

What are the two properties of lodestone?

It attracts small pieces of iron and sets itself along a definite direction when suspended freely.

What is induced magnetism?

The temporary magnetism acquired by a magnetic material when it is kept near or in contact with a magnet.

What happens to an unmagnetized bar of magnetic material when placed near a magnet?

It becomes a magnet, acquiring the property of attracting iron filings.

What do you observe when the magnet is removed from an induced magnet?

The induced magnet loses its magnetism and the iron filings fall off.

What is the principle of induction concerning magnets?

Induction precedes attraction; an ordinary piece of iron first becomes a magnet by induction before being attracted.

What are magnetic field lines?

Curved lines that represent the direction and strength of a magnetic field.

What are the properties of magnetic field lines?

They are closed curves, directed from north to south outside the magnet, do not intersect, and are crowded near poles.

How does Earth's magnetic field manifest itself?

A freely suspended magnetic needle always rests in the geographic north-south direction.

What are neutral points in magnetic fields?

Points where the net magnetic field is zero, causing a compass needle to rest in any direction.

What are the effects of the Earth's magnetic field?

It causes phenomena such as induced magnetism in rods buried underground and different angular positions of needles at various geographical locations.