Solenoid: In order to trap the starship Enterprise, the diabolical Klingons build a huge ideal solenoid 10 light-years long with a diameter of 2.0 million kilometers. Every kilometer of length of the solenoid contains 100 turns of wire. What magnetic field strength is produced near the center of the solenoid using a current of 2.00 kA? (?0 = 4? × 10-7 T ? m/A)
Fill in the blank(s) with the appropriate word(s).
251 µT
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A) 100 K. B) 200 K. C) 300 K. D) 400 K. E) more than 400 K.
A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
a. The wood floats on top of the oil, so it sticks up in the air. b. The wood does not change its position c. The wood sinks below the surface of the water. d. The wood is half in the water and half in the oil. e. The wood floats in the oil just above the water.
The coil of a generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf generated by this generator if it is spinning with an angular velocity of 4.0 rad/s in a 2.0 T magnetic field?
A) 100. V B) 50. V C) 400. V D) 75. V E) 0. V
In order for two objects to have the same temperature, they must
a. be in thermal equilibrium. b. be in thermal contact with each other. c. have the same relative "hotness" or "coldness" when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.