Electrical Engineering 117A - Fall 1995 - Neureuther - Final - EECS 117A Final Fall 1995 EECS 117A Fall 1995 Final Exam Professor A.R Neureuther

# Electrical Engineering 117A - Fall 1995 - Neureuther -...

• Notes
• 5
• 100% (1) 1 out of 1 people found this document helpful

This preview shows page 1 - 2 out of 5 pages.

EECS 117A, Final, Fall 1995 EECS 117A, Fall 1995 Final Exam Professor A.R. Neureuther Problem #1 (70 Points) Concepts from Electrostatics, Magnetostatics and Maxwell's Equations A coaxial transmission line consists of an inner perfect electric conductor of radius a , a material inner lining from a < r < b , and an outer perfect electrical conductor of radius c . The material lining has U r = 10 and E r = 4. The dimensions a , b , and c are 2, 4, and 6 mm respectively. I.a. (20 Points) Find the magnetic flux density vector B at the radius r of 3 mm and 8 mm when a current of 1 mA flows in the inner conductor and a current of 0.5 mA flows in the opposite direction in the outer conductor. I.b. (25 Points) Using Stoke's Theorem show how to derive an equation for the change in voltage with position down the transmission line as a function of the change in current with time. Identify in your derivation and algebraic expression for the inductance per unit length. Hint: Start with a sketch of the geometry and mathematical construct. I.c. (25 Points) State if the line is despersive and or lossy and give an expression for the phase velocity as a function of the angular frequency w, radial dimensions and material properties.

#### You've reached the end of your free preview.

Want to read all 5 pages?

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern