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. Determine the magnitude of the magnetic field at a point that is 2.0 mm from the axis of the conductor.
a. 8.0 mT
b. 3.0 mT
c. 5.3 mT
d. 16 mT
e. 1.2 mT
[Ques. 2] A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?
a. 3.0 mT
b. 12 mT
c. 5.3 mT
d. 7.4 mT
e. 8.0 mT
[Ques. 3] A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
a. 5.0 mT
b. 10 mT
c. 0.63 mT
d. 2.5 mT
e. 0.01 mT
[Ques. 4] A long cylindrical wire (radius = 2.0 cm) carries a current of 40 A that is uniformly distributed over a cross section of the wire. What is the magnitude of the magnetic field at a point which is 1.5 cm from the axis of the wire?
a. 0.53 mT
b. 28 mT
c. 0.30 mT
d. 40 mT
e. 1.9 mT
[Ques. 5] Two long parallel wires are separated by 4.0 cm. One of the wires carries a current of 20 A and the other carries a 30-A current. Determine the magnitude of the magnetic force on a 2.0-m length of the wire carrying the greater current.
a. 7.0 mN
b. 6.0 mN
c. 8.0 mN
d. 9.0 mN
e. 4.0 mN
[Ques. 6] Three long, straight, parallel wires all lie in the yz plane and each carries a current of 20 A in the positive z direction. The two outer wires are each 4.0 cm from the center wire. What is the magnitude of the magnetic force on a 50-cm length of either of the outer wires?
a. 1.0 mN
b. 0.50 mN
c. 1.1 mN
d. 1.5 mN
e. 2.0 mN
[Ques. 7] Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 N, what is the greater of the two currents?
a. 2.0 A
b. 1.0 A
c. 3.0 A
d. 9.0 A
e. 1.5 A
[Ques. 8] Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 N, what is the greater of the two currents?
a. 0.20 A
b. 0.40 A
c. 40 mA
d. 20 mA
e. 0.63 A
[Ques. 9] Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 N
b. 40 N
c. 69 N
d. 50 N
e. 20 N
[Ques. 10] A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
a. 17 T
b. 14 T
c. 11 T
d. 20 T
e. 36 T
Quick Reply
