# SJSU EE 140 - EE140_MT1D_S16 (3 pages)

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# EE140_MT1D_S16

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## EE140_MT1D_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 spherical dielectric r1 with radius a and volume charge density r is enclosed by a dielectric shell rs with outer radius b The volume charge density of the outer shell is uniform a Find E r everywhere b Sketch E r and label all the points b a r1 r2 EE140 2 Mid Term 1 Dr Ray Kwok a A wire of length L along the z axis from z L 2 to L 2 is carrying a dc current I in the z direction What is the magnetic field intensity B at a distance d away from the mid point b The same wire is now placed at a distance d above a ground plane as shown in the Fig 2 Find the B field along the y axis between the wire and the ground plane y d c What is the current density at the origin z L 2 I o d L 2 y L I d o EE140 Mid Term 1 Dr Ray Kwok 3 a What is the electric field 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 field of a charged cylindrical shell with uniform surface charge density length L at the center of one end as shown z R Length L Radius R Hollow shell E at center

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