An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/
A)
A) 16 mT
B) 4.9 mT
C) 15 mT
D) 6.0 mT
E) 9.0 mT
C
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Two flat rings each having outer diameter of 6 inches and inner diameter of 3 inches are parallel and 4 inches apart as shown. Determine the shape factors, F1-2 and F2-1, which are equal.
For most materials, the fatigue endurance limit is what percentage of the yield stress?
(a) 60 to 80 (b) 35 to 60 (c) 25 to 35 (d) 15 to 25
Biologists have found that life on Earth can
A) survive over a wide range of environmental conditions B) only survive on the surface of the Earth C) survive over only a very narrow range of environmental conditions D) survive only in the presence of sunlight
A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/
A) A) 4.7 µT B) 6.4 µT C) 20 µT D) 56 µT