P23_EMwaves

P23_EMwaves - Electromagnetic waves Recall: Induction...

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Electromagnetic waves
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Recall: Induction Changing magnetic field leads to induced voltage in wire loop . What if there is no wire loop?
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Induction Voltage = Electric field * distance No wire: Changing magnetic field leads to Electric field in pinwheel pattern ! I.e.: changing magnetic fields produce electric fields So what?
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Symmetry What about changing electric fields ? They induce magnetic fields ! (Maxwells proposal) I.e.: Changing B E Changing E B Changing B E (and so on…) Electromagnetic wave ! ( independent of wires!) James Clerk Maxwell
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Electromagnetic wave
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Generation and detection of EM Generation: Move charges in a wire up and down ( dipole antenna ) Electric field is parallel to the antenna
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Generation and detection of EM Detection: the alternating electric field will accelerate charges ( induce a current ) in a wire aligned with the electric field .
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Question A dipole antenna transmitter is set up vertically. A few meters away 3 receiver
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This note was uploaded on 01/15/2012 for the course PHY 101 taught by Professor Schwarz during the Fall '08 term at Syracuse.

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P23_EMwaves - Electromagnetic waves Recall: Induction...

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