Waves Practice Problem Set Worksheet Page 45
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ECHANICS
RACTICE
ROBLEM
ETS
Unit 11
M
AGNETISM
11.1
M
AGNETISM
1. Use the right-hand rule to find the direction of the current in a wire in a magnetic
field that results in the force on the wire shown for each case shown below:
2. A 50 cm long, straight wire conducts 4.0 A of current upward. The wire
-2
experiences a force of 1.0 x 10
N when in a magnetic field that is perpendicular
to the wire. What is the magnetic field around the wire?
Answer: 0.005 T
-4
3. A magnetic field of 1.0 x 10
T at 30° North of West acts on a 1.0 m wire that
carries a current of 15 A to the west. What is the magnitude and direction of the
-4
magnetic force on the wire? Answer: 7.5 x 10
N into the page
4. A wire with a length of 2.7 m and a mass of 0.89 kg is in a region of space with a
magnetic field of 0.72 T. What is the minimum current needed to levitate the
wire?
Answer: 4.5 A
-4
5. You want to produce a magnetic field with a magnitude of 5.50 x 10
T at a
distance of 0.040 m from a long, straight wire.
a. What current is required to produce this field?
Answer: 110 A
b. What is the magnitude of the field located at a distance of 0.080 m and
-4
-4
0.160 m? Answer: 2.75 x 10
T; 1.38 x 10
6. Two hikers are reading a compass under an overhead transmission line that is 5.50
m above the grand and carries a current of 800 A in a horizontal direction from
north to south. What is the magnitude and direction of the magnetic field at a
-5
point directly under the conductor?
Answer: 2.91 x 10
east
7. Two, straight, parallel, 1.0 m superconducting cables 4.5 mm apart carry equal
currents of 15,000 A in opposite directions. What is the force on each wire and
what type of force is it?
Answer: 10,000 N repulsive
8. Two long, parallel wires that are each 1.20 meters long are separated by a distance
-5
of 2.50 cm. The force each wire exerts on the other is 4.80 x 10
N. The wires
attract each other. The current in one wire is 0.600 A. What is the current in the
Gamzon & Gregorian-Michaelsen
6/7/16
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