A conducting hollow cylinder (inner radius = a, outer radius = b) carries a current of 40 A that is uniformly distributed over the cross section of the conductor. If a = 3.0 mm and b = 6.0 mm, what is the magnitude of the (line) integral 
around a circular path (radius = 5.0 mm) centered on the axis of the cylinder and in a plane perpendicular to that axis?
A. 50 ?T ? m
B. 30 ?T ? m
C. 22 ?T ? m
D. 37 ?T ? m
E. 47 ?T ? m
Answer: B
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Uncertainty Principle Using Momentum and Position: A molecule of roughly spherical shape has a mass of 1.80 × 10-25 kg and a diameter of 0.6 nm. If the uncertainty in the measured position of the molecule is equal to the molecular diameter, what is the minimum uncertainty in the speed of the molecule? (h = 6.626 × 10-34 J ? s)
A. 1 m/s B. 10 m/s C. 100 m/s D. 0.1 m/s E. 0.01 m/s
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every DT, no matter how large or how small DT is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.
__________are electromagnetic waves with wavelength shorter than ultraviolet (UV) light
A) Visible rays B) X-rays C) Microwaves D) Radio waves
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C