A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop.
a. 79 T
b. 69 T
c. 59 T
d. 89 T
e. 9.4 T
[Ques. 2] A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed.
a. 1.6 T
b. 4.9 T
c. 1.0 T
d. 9.8 T
e. 15 T
[Ques. 3] Two long parallel wires carry unequal currents in opposite directions. The ratio of the currents is 3 to 1 . The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 T. What is the larger of the two currents?
a. 0.5 A
b. 1.0 A
c. 1.5 A
d. 2.0 A
e. 3.0 A
[Ques. 4] 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?
a. 70 T
b. 40 T
c. 10 T
d. 50 T
e. 36 T
[Ques. 5] Two long parallel wires separated by 4.0 mm each carry a current of 24 A. These two currents are in the same direction. What is the magnitude of the magnetic field at a point that is between the two wires and 1.0 mm from one of the two wires?
a. 4.8 mT
b. 6.4 mT
c. 3.2 mT
d. 9.6 mT
e. 5.3 mT
[Ques. 6] Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT
b. 10 mT
c. 8.0 mT
d. 1.6 mT
e. 7.2 mT
[Ques. 7] Each of two parallel wires separated by 6.0 mm carries a 40-A current. These two currents are in the same direction. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires.
a. 2.6 mT
b. zero
c. 1.9 mT
d. 1.6 mT
e. 3.2 mT
[Ques. 8] 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)?
a. 3.8 mT
b. 2.7 mT
c. 2.9 mT
d. 3.0 mT
e. 0.6 mT
[Ques. 9] Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin?
a. 200 T
b. 600 T
c. 450 T
d. 300 T
e. 400 T
[Ques. 10] Two long parallel wires carry unequal currents in the same direction. The ratio of the currents is 3 to 1 . The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 T. What is the larger of the two currents?
a. 5.3 A
b. 3.8 A
c. 4.5 A
d. 3.0 A
e. 0.5 A
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