An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere
A. remains at rest.
B. moves toward the rod.
C. moves away from the rod.
D. moves perpendicular to the velocity vector of the rod.
E. moves upward off the puck.
Answer: B
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A. a tube of air closed at both ends. B. a tube of air open at one end. C. a tube of air open at both ends. D. a vibrating string with fixed ends.
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a. 6 b. 1 c. 4 d. 2 e. 1.5
The softest mineral on the Mohs hardness scale is named ______________
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