Phys201
Review Problems
–
Ch30
Page 1
Review Problems
–
Ch 30(Sources Of Magnetic Fields)
Phy201
–
Dr.Hikmat A. Hamad
1.
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated
by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the
wires?
Ans: 24
T
2.
Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in
the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from
each wire?
Ans: 48
T

Phys201
Review Problems
–
Ch30
Page 2
3.
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in
opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from
the wire carrying the 30-A current and 25 cm from the other wire?
Ans: 33
T
4.
Two very long parallel wires carry currents in the positive
x
direction. One wire (current = 15 A) is
coincident with the
x
axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0).
What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm)?
Ans:2.7 mT

Phys201
Review Problems
–
Ch30
Page 3
5.A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-T magnitude and is parallel to the current. What is the magnitude of the resultant magnetic field at a point that is 20 cm from the wire?
6.
A hollow cylindrical (inner radius = 1.0 mm, outer radius = 3.0 mm) conductor carries a current of 80
A parallel to its axis. This current is uniformly distributed over a cross section of the conductor.

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- Spring '12
- Prof.AchmadSalleh
- Current, Magnetic Field, Sources of Magnetic Fields, A. Hamad