A hollow cylindrical (inner radius = 1.0 mm, outer radius = 3.0 mm) conductor carries a current of 80 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 2.0 mm from the axis of the conductor
a. 8.0 mT
b. 3.0 mT
c. 5.3 mT
d. 16 mT
e. 1.2 mT
b
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A current in a solenoid with N turns creates a magnetic field at the center of that loop. The field strength is directly proportional to:
a. current strength. c. Both choices A and B are valid. b. number of turns in the loop. d. None of these choices are valid.
We can rule out a connection between changes in the Sun's luminosity and the global warming that is currently occurring on Earth because
A) the Sun's luminosity has remained fairly steady even as Earth's temperature as increased. B) the Sun is too far away to affect Earth's climate. C) changes in the Sun's luminosity cannot occur on the time scale over which global warming has occurred. D) Earth's atmosphere prevents changes in the Sun's luminosity from having any effect on Earth's surface.
Which of the following objects is considered to possibly contain a black hole?
a. the central star of the Crab nebula b. the Orion nebula. c. LMC X-3 d. Algol e. PSR 1257+12
Calorimetry: A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75°C into a 250-g aluminum cup, initially at 16°C. What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/kg ? K, and the specific heat of coffee is essentially the same as that of water, which is 4186 J/kg ? K.
A. 45°C B. 62°C C. 65°C D. 68°C E. 71°C