Physics 100B - General Physics II » Spring 2022 » Homework 5
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Question #1
A 0.40 µC particle moves with a speed of 17 m/s through a region where the magnetic field has a strength of 0.99 T. At what angle to the field is the particle moving if the force exerted on it is 4.8 X 10-16N?
A.
θ = 41o
B.
θ = 35o
C.
θ = 45o
D.
θ = 40o
Question #2
A 0.40 µC particle moves with a speed of 17 m/s through a region where the magnetic field has a strength of 0.99 T. At what angle to the field is the particle moving if the force exerted on it is 3.0 X 10-6N?
A.
θ = 26o
B.
θ = 36o
C.
θ = 24o
D.
θ = 21o
Question #3
A 0.40 µC particle moves with a speed of 17 m/s through a region where the magnetic field has a strength of 0.99 T. At what angle to the field is the particle moving if the force exerted on it is 1.0 X 10-7N?
A.
θ = 0.75o
B.
θ = 0.83o
C.
θ = 0.95o
D.
θ = 0.85o
Question #4
An electron moving with a speed of 5.3×105 m/s in the positive x direction experiences zero magnetic force. When it moves inthe positive y direction, it experiences a force of 3.2×10−13 N that points in the positive z direction. What is the direction of the magnetic field?
A.
-x̂
B.
ŷ
C.
ẑ
D.
-ẑ
E.
-ŷ
F.
x̂
Question #5
An electron moving with a speed of 5.3×105 m/s in the positive x direction experiences zero magnetic force. When it moves inthe positive y direction, it experiences a force of 3.2×10−13 N that points in the positive z direction. What is the magnitude of the magnetic field?
A.
B = 1.6 T
B.
B = 2.9 T
C.
B = 3.1 T
D.
B = 3.8 T
Question #6
The magnetic force exerted on a 1.3 - m segment of straight wire is 1.4 N. The wire carries a current of 3.2 A in a region witha constant magnetic field of 0.49 T. What is the angle between the wire and the magnetic field?
A.
θ = 27o
B.
θ = 43o
C.
θ = 39o
D.
θ = 54o
Question #7
A 0.54 m copper rod with a mass of 5.00×10−2 kg carries a current of 10 A in the positive x direction. Let upward be thepositive y direction. What is the magnitude of the minimum magnetic field needed to levitate the rod?
A.
B = 9.1 x 10-2 T
B.
B = 11.1 x 10-2 T
C.
B = 7.6 x 10-2 T
D.
B = 8.4 x 10-2 T
Question #8
A 0.54 m copper rod with a mass of 5.00×10−2 kg carries a current of 10 A in the positive x direction. Let upward be thepositive y direction. What is the direction of the minimum magnetic field needed to levitate the rod?
A.
negative z direction
B.
negative x direction
C.
positive z direction
D.
negative y direction
E.
positive y direction
F.
positive x direction
Question #9
A rectangular loop of 270 turns is 35 cm wide and 16 cm high. What is the current in this loop if the maximum torque in a field of 0.47 T is 23 N . m?
A.
I = 3.2 A
B.
I = 3.8 A
C.
I = 5.4 A
D.
I = 2.7 A
Question #10
Two power lines, each 290 m in length, run parallel to each other with a separation of 27 cm. If the lines carry parallel currents of 130 A, what is the magnitude of the magnetic force each exerts on the other?
A.
F = 4.4 N
B.
F = 2.8 N
C.
F = 3.6 N
D.
F = 3.9 N
Question #11
Two power lines, each 290 m in length, run parallel to each other with a separation of 27 cm. What is the direction of the magnetic force each exerts on the other?
A.
away from each other
B.
toward each other
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