Two Spheres Are Made of Conducting Material

question 22

Multiple Choice

Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1. What is the ratio of the capacitance of Sphere #2 to the capacitance of sphere #1?

• A) 1, since all conducting spheres have the same capacitance.
• B) 2
• C) 4
• D) 8
• E) A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.

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Definitions:

Cast Materials

Materials that have been shaped by pouring them into a mold while liquid and allowing them to solidify.

Unified National Coarse

A thread standard that specifies the shape, dimensions, and tolerances for coarse threads used broadly in bolts, nuts, and screws in the United States.

Unified National Code

A thread standard used in the United States and Canada for bolts, screws, and nuts, specifying the shape, angle, diameter, pitch, and length of threads.

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