1
Physics 4B
THIRD EXAM
Chapters 22  32
Spring 1997
Name:_________________________________________
Solve the following problems in the space provided.
Use the back of the page if needed.
Each problem is
worth 20 points.
You
must
show your work in a logical fashion starting with the correctly applied physical
principles which are on the last page.
Your score will be maximized if your work is easy to follow because partial
credit will be awarded.
1.
An electron is traveling northward at 3.20x10
6
m/s near Chico where the magnetic field of Earth is northward
and has a magnitude of 52.0μT at 62˚ below the horizontal.
(a)Find the horizontal component of the field and
(b)the vertical component of the field.
(c)Find the magnitude and direction of the force exerted on the electron by
the horizontal component of the field and (d)the vertical component of the field.
(a)Taking the vector components, B
h
=
Bcos
θ =
52.0cos62˚
=
24.4
μ
T
(b) and B
v
=
Bsin
θ =
52.0sin62˚
=
45.9
μ
T
.
(c)The force on a moving charge is,
r
F
=
q
r
υ×
r
B since the velocity is in the same direction as this
component of the field, the force due to this component is
zero
.
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 Fall '09
 Staff
 Work, Magnetic Field, Faraday, net magnetic flux

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