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Chapter 14

PHYS 101 Chapter Notes - Chapter 14: Electromotive Force, Galvanometer, Ammeter


Department
Physics
Course Code
PHYS 101
Professor
Samanthi Wickramarachchi
Chapter
14

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Magnets and Electromagnetism [ Chapter 14 ]
All magnets have to poles:
North pole which is South Seeking Pole
South pole which is North Seeking Pole
If you bring two poles together:
Like Poles will repel
Unlike poles will attract
*Similar to electricity
If we make a magnet in half they will still have a North & South pole, because no magnets are
monopoles ( meaning only one pole such as only North or South).A magnet is always at least a
magnetic dipole: we cannot completely isolate a single magnetic pole. A dipole consists of two
opposite poles separated by some distance.
Direction of the magnetic field is where the compass will point shows that magnetic field is a
vector
Is Earth a Magnet?
Earth behaves like a large magnet. Since unlike poles attract, the south pole of the Earth’s
magnet must point in a northerly direction.
The north seeking pole of the compass aligns itself northward along the field lines
produced by the Earth.
The axis of the Earth’s magnetic field, though, is not aligned exactly with the Earth’s axis
of rotation. Since the rotational axis defines geographic or true north, the compass needle
does not point exactly at most location.
Magnetic Field Unit
1 Tesla (T) = 1 N/(Am)
Tesla = the unit of magnetic field is equal to 1 newton per ampere-meter
Magnetic field is the magnetic force per unit of charge and unit of velocity. We obtain magnetic
forces when charges are moving.
Magnetic forces are exerted by magnets on other magnets
The magnetic field produced by the current in the wire is perpendicular to the direction of the
current.
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