Download Magnetism Problem Set

Physics 1
Magnetism
Name:
Magnetism Problem Set
1. Draw the magnetic field lines around a straight section of wire carrying a current horizontally left.
2. Draw the magnetic field lines around a straight wire carrying current that is moving directly towards you.
3. Electric current is flowing through a copper wire.
a. What is the force per meter on the wire when carrying 9.8 A of current and is inserted
perpendicularly to a 0.80 T magnetic field?
b. What is the force if the angle between the wire and the magnetic field is 45 o?
4. A 1.5 m wire carrying 6.5 A of current is oriented horizontally. At this point on the Earth’s surface, the dip
angle of the Earth’s magnetic field makes an angle of 40o to the wire. What is the magnitude of the force on
the wire due to the Earth’s magnetic field of 5.5 X 10-5 T at this point?
5. How much current is flowing in a wire 4.2 m long if the maximum force on it is 0.900 N when places in a
uniform 0.0800 T field?
6. The force on a wire carrying 25.0 A is a maximum of 4.14 N when placed between the poles of a magnet. If
the pole faces are 22 cm in diameter, what is the approximate strength of the magnetic field?
7. Determine the magnitude and direction of the force acting on a electron traveling 3.58 X 106 m/s
horizontally west in a vertically upward magnetic field of strength 1.30 T.
8. An electron with a speed of 1.80 X 106 m/s enters a 0.250 T magnetic field at an angle of 90o.
a. What is the magnitude of the force?
b. If the electron is moving north in a horizontal plane and the magnetic field is directed vertically
downward, what direction will the electron be deflected?
9. Indicate the direction a proton will be deflected in the situations below. B is the magnetic field and v
represents the direction the proton is moving.
a)
B
.
v
b)
XB
v
c) v
X
d)
B
B
e)
v
f)
B
v
v
.
B
10. The rectangular loop of wire shown in the diagram is pushed into the magnetic field which points inward as
shown. In what direction is current induced?
XXX
XXX
XXX
XXX
XXX
XXX
XXX
XXX
11. The north pole of a magnetic is inserted into a coil of wire as shown in the diagram. In which direction will
current flow through the resistor R?
S
N
R
1. See Instructor
2. See Instructor
3. a) 7.84 N
b) 5.54 N
4. 3.45 x 10-4 N
5. 2.68 A
6. 0.753 T
7. 7.45 x 10-13 N
South
8. a) 7.2 x 10-14 N
b) East
9. a) right b) right
c) down d) out of
the page
e) zero f) up
10. counter clockwise
11. right to left