ENEE 380 Fall 2011
Homework 2 (Due: September 22, 2011 in class)
September 15, 2011
1. Griffiths Problem 2.25
2. Griffiths Problem 2.36
3. Griffiths Problem 2.39: Calculate the capacitance by
a) Assuming positive and negative charges on each conductor and
ENEE 380 Fall 2011
Homework 3 (Due: October 4, 2011 in class)
September 27, 2011
1. A semiconductor pn-junction is formed by doping a pure semiconductor p-type (with
mobile positive charges called holes) on one side and n-type (with mobile negative
electr
ENEE 380 Fall 2011
Homework 6 (Due: November 17, 2011 in class)
1. Griffiths Problem 5.9
2. Griffiths Problem 5.10
3. Griffiths Problem 5.13
4. Griffiths Problem 5.14
5. Griffiths Problem 5.15
November 9, 2011
ENEE 380 Fall 2011
Homework 7 (Due: November 29, 2011 in class)
November 20, 2011
1. Griffiths Problem 5.22
2. Griffiths Problem 5.23
3. Griffiths Problem 5.26
4. Griffiths Problem 5.29
5. Show that the inductance per unit length of two parallel wires eac
ENEE 380 Fall 2011
Homework 8 (Due: December 6, 2011 in class)
November 29, 2011
1. Griffiths Problem 6.12
2. Griffiths Problem 6.17
3. Griffiths Problem 6.18
4. Griffiths Problem 6.26 (Ignore the question on the comparison with Eq. 4.68)
ENEE 380 Fall 2011
Homework 9 (Due: December 13, 2011 in class)
December 6, 2011
1. A square loop of side a recedes with a uniform velocity uo a y from an infinitely long wire
carrying current I along az . Assuming that the side of the loop closest to the
ENEE 380 Fall 2011
Discussion Quiz 10
November 11, 2011
1. Calculate the magnetic field a distance z above the center of a circular loop of radius R
which carries a steady current I.
2. Using Amperes law, calculate the magnetic field a distance r from an
ENEE 380 Fall 2011
Sample Exam Problems
September 30, 2011
1. Two concentric thin spherical shells with radii a and b (a > b) are charged with surface
charge densities and -, respectively.
a) Calculate the electric potential at all regions.
b) Determine t
ENEE 380 Fall 2011
Sample Exam Problems
October 30, 2011
1. A one-dimensional device consisting of a linear dielectric with dielectric constant r is
charged with a charge density given by o x a . If E 0 at x 0 and V 0 at
x a , find V x and E x . Determine
ENEE 380 Fall 2011
Sample Exam Problems
December 6, 2011
1. a) Determine the vector potential a distance s from an infinite straight wire carrying a
current I.
b) Find the magnetic vector potential inside the wire, if it has radius R and the current is
un
Problem 1
a) Boundary conditions include continuity of potential and electrical eld
(derivative of potential) at x = 0, and continuity of electrical eld at x = xp
and x = xn , namely
1. Vp (0) = Vn (0)
2.
x Vp (0)
3.
x Vp (xp )
4.
x Vn (xn )
=
x Vn (0)
=0
ENEE 380 Fall 2011
Discussion Quiz 1
2 September 2011
Note: This is an assessment test on vector calculus. It is not a graded quiz. Answer as many
problems as you can.
1. Find the angle between the body diagonals of a cube. (Hint: Determine the vectors
co
ENEE 380 Fall 2011
Discussion Quiz 3
September 16, 2011
1. Calculate the electric potential inside a uniformly charged spherical shell of radius R and
surface charge density .
2. Two charges (+q and q) are situated at the corners of an equilateral triangl
Problem 1
We assume +q and q on each plate respectively. The surface density:
= /
Using Gausss Law, we obtain that between two conductor the electric field:
= =
Potential difference
= =
Then the capacitance
=
=
Problem 2
Set up Cartesian coordin
ENEE 380 Fall 2011
Discussion Quiz 5
September 30, 2011
1. Griffiths Problem 3.6: Find the force on the charge +q in the figure below. (The xy plane
is the grounded conductor)
2. A circular wire of radius R and uniform line charge density is placed above
ENEE 380 Fall 2011
Discussion Quiz 8
October 21, 2011
1. A grounded spherical conducting shell of radius R1 is enclosed by a charged thin
spherical shell of radius R2 with surface charge density o cos . The spherical shells are
concentric.
a) Write the ge
ENEE 380 Fall 2011
Discussion Quiz 2
September 9, 2011
1. Griffiths Problem 2.6: Find the electric field a distance z above the center of a circular
disk of radius R which carries a uniform surface charge . (Hint: Use the result in
Problem 2.5 for the ele