HW8
1.
Find the magnetic field at point P for each of the following steady current configurations.
2.
Find the force on a square loop and a triangle near in infinite straight wire.
3.
A thick slab extending from z=a to z=+a carries a uniform volume current density
x
J
J
.
Find the magnetic field, as a function z, both inside and outside the slab.
4.
What current density would produce the vector potential,
e
k
A
(where k is a constant), in
cylindrical coordinates?
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
5.
If
B
is uniform, show that
)
(
2
1
B
r
A
works.
That is check
)
(
2
1
B
r
A
and
)
(
2
1
B
r
A
.
6.
A thin uniform donut, carrying charge Q and mass M, rotates about its axis as shown below.
(a)
Find the ratio of its magnetic moment to its angular momentum,
This is called
gyromagnetic ratio.
(b)
What
’
s the gyromagnetic ratio for a uniform spinning sphere? [This requires no new
calculation; simply decompose the sphere into infinitesimal rings, and apply the result of
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '09
 Qiu
 Electron, Magnetism, Magnetic Field, Fundamental physics concepts, dipole moment

Click to edit the document details