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Lecture 9 SSI 10 Pre Lecture

# Lecture 9 SSI 10 Pre Lecture - Physics7CSSI2010...

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Physics 7C SSI 2010: Lecture 9: Changing E and B  fields and EM Waves

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Agenda Changing Electric and Magnetic Fields Electromagnetic Waves (Light) and Polarization Introduction to Quantum Mechanics: Photons, electrons and probability waves Quiz 6
Example: Changing  E  fields create  B   fields Start with a neutral wire, as shown to the right

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Example: Changing  E  fields create  B   fields Now place a battery in the middle (basically charged plates), which of course we know creates an electric field + -
Example: Changing  E  fields create  B   fields As the electric field forces the + charges up and the – charges down, a current is created which… causes a magnetic field! + - + charges moving up -charges moving down Creates a current going up!

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Example: Changing  E  fields create  B   fields After the battery has been there for some time, all of the charges settle and the current stops, so no more magnetic field! + -
Example: Changing  E  fields create  B   fields Now flip the battery so that we change the direction of the electric field. Current starts in the other direction Magnetic field in the opposite direction is created! + - + charges moving down -charges moving up Creates a current going down!

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Example: Changing  E  fields create  B   fields Big Picture As we CHANGED the electric field from zero to
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Lecture 9 SSI 10 Pre Lecture - Physics7CSSI2010...

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