Unit 3 - Magnetism  

A) Magnetism is a ___________that exists between _____________________

 ______________________always create _____________

·        Natural Magnetism comes from - spinning _______________ in atoms

 ·        Electric current - Where there is ______________there is always_________________

B) Magnetic Fields - regions in space where a magnetic force may be detected

            We will focus on fields around:

         1) current carrying ___________

                                           2) permanent and electro-magnets

Example 1)  Magnetic _____________around a Bar Magnet - (Note: Actual Magnetic Fields contain many more lines of magnetism)    

1.     Magnetic flux lines - lines of magnetism in a magnetic field.

A magnetic field is not _______________________.

Between each line of magnetism their exist __________________

a)   The ______________of a ________________line up perfectly with the flux lines

b)   The _________________on a flux line show where the _________________Pole of a compass would point in that field.

REMEMBER THIS: Flux arrows point _____________________________________and back over again to North

c)    Magnetic force strongest at the _______________where flux lines are ________

d)   Measuring the strength of a magnetic field

QUESTION: How do you measure the strength of a magnetic field?

ANSWER: Put a wire with a known current into the field and measure the ____________

 __________________ on the wire