magnetism - mrs. harris's world of science science/magnetism student versio… · magnetism...
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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)
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)
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
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