SJSU EE 140 - EE140_MT1A_S16 (3 pages)

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EE140_MT1A_S16

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EE140_MT1A_S16

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Pages:
3
School:
San Jose State University
Course:
Ee 140 - Principles of Electromagnetic Fields
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EE140 Mid Term 1 Dr Ray Kwok Print Name 1 A long coaxial cable of radius a is carrying a non uniform current density J r 2 z into the page The outer shield is a grounded conductor and a dielectric r is filled between b and c B 0 in the grounded shield b r c a What are the magnetic fields inside the cable b Use the formula c b a n 2 H1 H 2 J s to derive the surface current density at r a and r b EE140 2 Mid Term 1 Consider 2 point charges Q at y d and Q at the origin as shown a What is the electric field vector at a point on the x axis x 0 0 b With V E d find the electric potential at a distance d away on the x axis d 0 0 c Compare this result with the potential using the point charge equation y Q d Q O x Dr Ray Kwok EE140 3 Mid Term 1 Dr Ray Kwok a What is the electric potential of a uniformly charged ring of radius R at a distance z away from the center as shown b Using the result from part a derive the electric potential of a charged disc with non uniform surface charge density s a r2 at a distance z away from the center as shown c From this electric potential write the electric field vector of the charged disc at this location z using z R R z E V

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