Phys ch. 22

how many poles do magnets have

2 poles

what are the poles of a magnet

north and south poles

(T/F) So far, no monopole (single pole) have been discovered

true

like poles of magnets ____ each other

repel

opposite poles of magnets _____ each other

attract

The Earth acts like a very large bar magnet with its south-
seeking pole near the geographic ______ pole

north

North pole of your compass is attracted toward the geographic _____ pole of the Earth

North Pole

Permanent bar magnets have _____ poles on each end

opposite

If a magnet is broken in half, each half has ____ poles

two poles/ each will have a north and south pole

(T/F) An unmagnetized piece of iron can be magnetized by stroking it with a
magnet

true; this process is similar to conduction of electrical charge

(T/F) Magnetism can be induced

True; If a piece of iron, for example, is placed near a strong permanent magnet,
it will become magnetized

what are soft magnetic materials

soft magnetic materials are easily magnetized; they also tend to lose their magnetism easily

ex; iron

what are Hard magnetic materials

Hard magnetic materials are difficult to magnetize; They tend to retain their magnetism

ex; cobalt and nickel

A magnetic field represents _____

magnetic forces

pictorial representation of magnetic field lines helps to visual _____ of the magnetic field.

the strength and direction

Direction is given by the direction a ______ of a compass needle points in
that location.

north pole

The strength of the magnetic field is _____ to the closeness (or density) of the lines.

proportional

If the interior of the magnet could be probed, the field lines would be found to form ______.

continuous closed loops