The speed of waves on a thin wire is 150 m/s. The density of the material that the wire is made of is 5000 kg/m3. The wire has a 0.500 mm diameter circular crosssection. What is the tension that the wire is under?
A)
76.2 N
B)
22.1 N
C)
88.4 N
D)
0.147 N
E)
56.7 N
Question 2
A solenoid of inductance L = 50 mH has a magnetic energy U = 3 x 10-4 J with a density u = 0.0042 J/ m3. What is the winding density n of the solenoid?
A)
58 turns/m
B)
1584 turns/m
C)
1200 turns/m
D)
234 turns/m
E)
746 turns/m
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