TA: Tomoyuki Nakayama
Thursday, July 1, 2010
PHY 2048: Physics 2 with Calculus, Summer C 2010
Review (Chapter 29.1 30.12)
The purpose of this review is to refresh your memory. Physics is a cumulative subject, so make it
sure that you understand basic concepts and typical problem solving techniques in previous chapters
before moving on to a new chapter.
________________________________________________________________________________
A. Magnetic Field due to Currents
In the figure, current
i
= 50 mA is set up in a loop having two radial lengths and two semicircles of
radii
a
= 4 cm and
b
= 8 cm with a common center
P
. Find the magnetic field at
P
and the loop’s
magnetic dipole moment.
B. Magnetic Force between Two Parallel Currents
Three long wires are parallel to a
z
axis, and each carries a current of 2 A in the positive
z
direction
There points of intersection with the
xy
plane form an equilateral triangle with sides of 30 cm as
shown in the figure. A fourth wire (wire
b
) passes through the midpoint of the base of the triangle
and is parallel to the other three wires. If the net magnetic force on wire
a
is zero, what are the
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 Summer '08
 Any
 Physics, Magnetic Field, A. Magnetic field, Tomoyuki Nakayama

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