MAGNETISM

SPS10. Students will investigate the properties of electricity and magnetism

c. Investigate applications of magnetism and /or its relationship to the movement of electrical charge as it relates to electromagnets, simple

motors and permanent magnets

What Is Magnetism? How can we use it?

Magnetism

•  The _______ that acts at a __________ •  Caused by ___________ _______ •  Strongly ________ metals like

_______, _______ and _______ •  _______ for opposite _______ •  Similar to _______ _______ •  Different from _______ _______

What is a magnetic field?

•  Consists of imaginary _______ lines coming from _______ or spinning electrically charged particles: a proton spinning or electrons moving through a wire in an electric current

Magnetic Field

•  Must have poles: _______ and _______ •  The same directions as the earth’s •  Direction of field goes from _______ to

_______ •  Opposite poles _______; like poles

_______ (push away)

Magnetic Field

•  Opposites attract •  Fields are combined to create one large

magnetic field

Magnetic Field

•  “Likes” repel •  Fields do not combine…still have separate

magnetic fields

Magnets

•  Object or material that _______ certain _______ (iron, nickel, cobalt)

•  Have _______ & _______ poles •  3 types: _______, _______ and

_______

Magnets

•  __________: holds magnetic properties over a long period of time

•  __________: eventually loses magnetism (soft iron)

•  __________: electrical wire wrapped around an iron or steel core (used with DC electricity)

Magnets

•  Can be 2 main shapes •  _______ & _______ •  Can also be _______

What happens when you cut a magnet?

•  You still have 2 poles for each piece of the magnet

Uses for Magnets

•  _______: the needle always points northward

•  _______ _______ •  To put things on the refrigerator

Similar to electric fields?

•  The poles (north & south) are very similar to the positive and negative charges

•  In electricity the charges repel….in magnetism, the poles repel

Different from electric fields?

•  Magnetic field is a _______ field: every magnet must have _______ _______

•  Electric fields are _______: the positive and negative charges can stand alone

Magnetism

•  A force that acts at a distance •  Is caused by a magnetic field •  The magnetic force strongly attracts an

opposite pole of another magnet and repels a like pole.

•  The magnetic field is both similar and different than an electric field.