Lecture8

# Lecture8 - Phy7C: Lecture8:Magnetism The Study of Magnetic...

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Phy 7C: Lecture 8: Magnetism The Study of Magnetic Fields

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Field Model: Magnetic Fields A source creates a magnetic field B 1 . Direction is ? . Magnitude is ? . The net field B tot is the vector sum of all the source fields. A test , placed in a magnetic field, experiences an magnetic force Magnitude given by: ? . Direction of force is: ? . We need to fill in the blanks!
Magnetic Dipoles (Compasses) Compasses or bar magnets, if allowed, will always orient north-south Why?

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Magnetic Dipoles Compasses (magnetic dipoles) orient in the same direction as the magnetic field.
Magnetic Dipoles If we allow iron fillings (which are like tiny dipoles) freedom to rotate, and put them near a current- carrying wire, this is how they align:

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Magnetic Dipoles and the Source of  Magnetic Fields This tell us that a current carrying wire produces a magnetic field, so… The source of a magnetic field is a moving electric charge!! Same picture as previous slide but with view looking down the wire
The Direction of the Magnetic Field Magnetic Dipoles align with the magnetic field The picture below also tells us how to determine the magnetic field due to the wire! Notice how the magnetic field seems to “curl” around the wire

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Determining the Direction of the  Magnetic Field: Right Hand Rule #1
Field Model: Magnetic Fields A source current I creates a magnetic field B 1 . Direction is determined by RHR #1 . Magnitude is ? . The net field B tot is the vector sum of all the source fields. A test , placed in a magnetic field, experiences an magnetic force Magnitude given by: ? . Direction of force is: ? . We can now start to fill in the chart!

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Determining the Direction of the  Magnetic Field I A B C 1) Into the screen 2) Out of the screen 3) Towards the wire 4) Away from the wire 5) Points down 6) Points up 7) Another direction What is the direction of the magnetic field due to the wire at point A?
Determining the Direction of the  Magnetic Field I A B C 1) Into the screen 2) Out of the screen 3) Towards the wire 4) Away from the wire 5) Points down 6) Points up 7) Another direction What is the direction of the magnetic field due to the wire at point B?

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Magnetic Field: Review of RHR1 1) Left 2) Right 3) Up 4) Down 5) Out of the screen 6) Into the screen 7) None of these What is the direction of the magnetic field at point A? I
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## This note was uploaded on 12/06/2009 for the course PHY 7C taught by Professor Mahmud during the Fall '08 term at UC Davis.

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Lecture8 - Phy7C: Lecture8:Magnetism The Study of Magnetic...

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