Physics 100B - General Physics II » Spring 2022 » Pre-Class 10

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Question #1
A long, straight, vertical wire carries a current upward. Due east of this wire, in what direction does the magnetic field point?
A.   east
B.   south
C.   downward
D.   west
E.   upward
F.   north
Question #2
Two long parallel wires are placed side by side on a horizontal table. The wires carry equal currents in the same direction.Which of the following statements are true?
A.   The magnetic field is a maximum at a point midway between the two wires. The magnetic force between the two wires is repulsive.
B.   The magnetic field at a point midway between the two wires is zero. The magnetic force between the two wires is attractive.
C.   The magnetic field at a point midway between the two wires is zero. The magnetic field is a maximum at a point midway between the two wires.
D.   The magnetic field at a point midway between the two wires is zero.The magnetic force between the two wires is repulsive.
Question #3
A 65-cm segment of conducting wire carries a current of 0.35 A. The wire is placed in a uniform magnetic field that has amagnitude of 1.24 T. What is the angle between the wire segment and the magnetic field if the force on the wire is 0.26 N?
A.   43°
B.   37°
C.   23°
D.   67°
E.   53°
Question #4
Two long straight wires are parallel to each other and are separated by 78 mm. The current in wire 1 is 3.55 A and thecurrent in wire 2 is 2.75 A. What is the force per unit length between the two wires?
A.   3.2 × 10-5 N/m
B.   2.5 × 10-8 N/m
C.   2.5 × 10-5 N/m
D.   1.9 × 10-5 N/m
Question #5
A circular coil of conducting wire, with a radius of 4.48 cm and 25 turns, is in a 1.67-T magnetic field. When the coil’s dipolemoment vector makes an angle of 34° with the magnetic field, a 0.537-N•m torque is exerted on the coil. What is the currentin the coil?
A.   2.46 A
B.   3.65 A
C.   2.04 A
D.   81.8 mA
E.   0.365 mA

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