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MIT6_641s09_quiz2008

# MIT6_641s09_quiz2008 - MIT OpenCourseWare http/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 6.641 Electromagnetic Fields, Forces, and Motion Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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_______________________________________________________________________________ Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 6.641, Electromagnetic Fields, Forces, and Motion Quiz 1 March 18, 2008 The 6.641 Formula Sheet appears at the end of this Quiz. In addition, a 8 1/2” x 11” formula sheet (both sides) that you have prepared is allowed. z μ 0 I y x σ ⇒ ∞ 1. (30 points) A line current of semi-infinite length stands perpendicularly upon a perfectly conducting ground plane at z = 0 . a) Find a suitable image current to find the magnetic field for z > 0 . Does the direction of the image current surprise you? b) What is the magnetic field magnitude and direction for z > 0 ? c) What is the surface current magnitude and direction on the z = 0 surface of the conducting plane?
text 0 ( ) / r r a σ σ = b a + _ i v Depth L ε 0 ε 2.

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MIT6_641s09_quiz2008 - MIT OpenCourseWare http/ocw.mit.edu...

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