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Unformatted text preview: HW6
1. A rectangular pipe, running parallel to the z axis (from ∞ to +∞), has three ground metal
sides at y=0, y=a, and x=0. The fourth side, at x=b, is maintained at a specific potential
V0(y).
(a) Develop a general formula for the potential within the pipe.
(b) Find the potential explicitly for the case of V0(y)= V0 (constant). 2. A cubical box (side length of a) consists of five metal plates (x=0, x=a, y=0, y=a, and z=0),
which are welded together and grounded. The top (z=a) is made of a separate sheet of metal,
insulated from the others, and held at a constant potential V0. Find the potential inside the
box. 3. Find the potential outside a charged metal sphere (Charge Q, radius R) placed in an otherwise
uniform electric field E0. 4. Four charged particles are placed as shown in the figure. Find a simple approximation for
the potential far away from the origin. (Express your answer in spherical coordinates.) 5. For a spherical shell of radius R with a surface charge k cos .
(a) Calculate the dipole moment of this charge distribution.
(b) Find the approximate potential, at points far away from the sphere, and compare the exact
kR3 cos V ( r , ) result
3 0 r 2 . What can you conclude about the higher multipoles? ...
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This note was uploaded on 02/06/2010 for the course PHYSICS 11 taught by Professor Qiu during the Fall '09 term at University of California, Berkeley.
 Fall '09
 Qiu
 Magnetism

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