St. Mary's U. Astronomy & Physics Dept.
B) Magnetic Fields - regions in space where a magnetic forces may be detected
Magnetism
We will focus on fields around:
1) current carrying wire
2) permanent & electromagnets
3) Bar Magnets
Magnetic lines of force of a bar magnet shown by iron
filings on paper:Magnet
from
(Actual magnetic fields contain
NASA
Solar Flames are deflected by the suns magnetic field
1. Magnetic flux lines - lines of magnetism in a magnetic field.
- magnetic field is not continuous.
Between each line of magnetism
... no magnetic field
a) The needles of a compass line up perfectly with the flux lines
b) The arrows on a flux line show where the North Pole of a compass would point in that field.
Source Unknown
Compass / Bar Magnet
c) Magnetic force strongest at the ...
At Poles ...
... where flux lines are closest.
Cutting Magnets ...
... each piece is a brand new magnet
How can magnets attract non-magnets? St. Mary's Physics YouTube Channel
Directions: Slide the magnet on the right over to the metal on the left. (unmagnetized metal on left)
Certain metals contain magnetic regions called domains. They are randomly orientated.
Ex) Which diagram best represents magnetic flux lines around a bar magnet?
Flux lines don't cross, Out of North into South
d) Measuring the strength of a magnetic field
Put a wire with a known current into the field and measure the force on the wire
Where does the north pole
Earth's Magnetic Field
What are these magnetic lines called? Where is the field strongest?
Mina Gong - 2009
Flux lines, The field is strongest at the poles
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