Charge on Conductors: a Hollow Conducting Spherical Shell Has Radii

question 39

Multiple Choice

Charge on conductors: A hollow conducting spherical shell has radii of 0.80 m and 1.20 m, as shown in the figure. The sphere carries a net excess charge of -500 nC. A point charge of +300 nC is present at the center. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C) The radial component of the electric field at a point that is 0.60 m from the center is closest to

• A) zero.
• B) +5000 N/C.
• C) +7500 N/C.
• D) -5000 N/C.
• E) -7500 N/C.

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Definitions:

Photosynthesis

The process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy in the form of glucose, using water and carbon dioxide and releasing oxygen as a byproduct.

Biomass

A quantitative estimate of the total mass, or amount, of living material in a particular ecosystem.

Gross Primary Productivity

The total rate at which photosynthetic organisms in an ecosystem convert carbon dioxide into organic carbon compounds.

Net Primary Productivity

The rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem minus the rate at which they use some of these compounds through respiration.