A point charge is positioned in the center of a hollow metallic shell of radius R During four experiments the value of the point charge and the total charge on shell were respectively 1) 5q; 0
2) 6q; +2q
3) 2q; -3q
4) 4q; +12q
1. Rank the experiments according to the charge on the inner surface of the shell, largest (most positive) to smallest.
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Deductions 0%
Potential 100%
The charge on the inner surface will stay 0 in each experiment:
1-3-4-2
2-4-3-1
2-3-1-4
1-2-3-4
2) Rank the experiments according to magnitude of the electric field at a distance R2 from the center of the shell largest to smallest.
3) Rank the experiments according to the magnitude of the electric field at a distance 3R from a center of the shell, largest to smallest.

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?