P219lecture09magneticwires

# P219lecture09magneticwires - Goal To understand...

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Goal: To understand Electro- magnetic fields Objectives: 1) Learn what Electro-Magnetic Fields are 2) Learn how to calculate the Magnetic Force on a wire 3) Learn to find the Magnetic Field for a straight wire 4) Learn to calculate the Magnetic Field from a coiled wire 5) To learn about Solenoids 6) Learn how to create your own magnet!

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Electro-Magnetic Fields Magnetic Fields tend to occur in the presence of electric fields when there are moving charges. In fact Magnetic Fields are created to offset the electric field and the moving charges! Conversely a magnetic field can induce an electric current – but that is tomorrow.
Magnetic Force on a wire If a wire is in a magnetic field then there will be a force exerted on it! F = q VXB But, I = q / t So, qV =q L / t = I * L So, F = I L X B

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Direction of the force But what about the direction the force? The current is moving up or down the wire. For a wire, the magnetic field circles the wire in a direction counter clockwise to the direction of the current. One way to remember this is to use you hand – and your thumb is the current. The field is your closed hand (give the magnetic
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P219lecture09magneticwires - Goal To understand...

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