Physics 112 HW #6
April 23, 2010
1. An electron has a kinetic energy of
4.60
10
17
J. It moves on a circular path that is
perpendicular to a uniform magnetic field of magnitude
4.80
10
5
T. Determine the
radius of the path?
1.19
2. Suppose that the target is located at the coordinates
x
=
0.12
m and
y
=
0.12
m. In
addition, suppose that the particle is a proton and the magnetic field has a magnitude of
0.012
T. The speed at which the particle is projected is the same for either of the two
paths leading to the target. Find the speed.
13.8e4
3. A wire carries a current of 0.66 A. This wire makes an angle of 58° with respect to a
magnetic field of magnitude
4.20
10
5
T. The wire experiences a magnetic force of
magnitude
6.80
10
5
N. What is the length of the wire?
2.89
4. Two insulated wires, each
2.10
m long, are taped together to form a twowire unit that
is
2.10
m long. One wire carries a current of 7.00 A; the other carries a smaller current
I
in the opposite direction. The two wire unit is placed at an angle of
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 Spring '10
 Any
 Physics, Energy, Kinetic Energy, Magnetic Field

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