Lecture 8 SSI 10 Pre Lecture

# Lecture 8 SSI 10 Pre Lecture - Physics7CSSI2010:...

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Physics 7C SSI 2010: Lecture 8: Magnetic Field  Model

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Today’s Agenda Magnetic Dipoles Magnetic Fields: RHR #1 Magnetic Forces: RHR #2 Quiz 5
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!

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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

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## Lecture 8 SSI 10 Pre Lecture - Physics7CSSI2010:...

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