A long straight wire carries a current. A positive charge moves toward the wire in a direction perpendicular to the wire. The direction of the force on the charge will be
A. parallel to the wire opposite the direction of the current.
B. parallel to the wire in the direction of the current.
C. There is no force
D. opposite the direction of the charge's velocity.
E. in the direction of the charge's velocity.
Answer: A
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A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
A tennis ball bounces off a brick wall. Which of the following is true?
A. The momentum of the ball is conserved in this process B. If the collision is elastic, then the ball's velocity does not change in this process C. The total momentum of the ball, wall, and Earth is conserved in this process D. None of these choices are true
One mole of hydrogen, one mole of nitrogen and one mole of oxygen are held in a 22.4 × 10^3 cm3 enclosed vessel at 20°C. The pressure in the vessel, in N/m2, is
a. 109. b. 304. c. 326. d. 1.09 × 10^5. e. 3.26 × 10^5.
The identification of "spiral nebulae" as large groupings of stars outside of our own galaxy was proven by ____
a. photographic plates made by Edwin Hubble showing stars and Cepheid variables b. the results of the Shapley-Curtis debate c. Immanual Kant's "island universe" theory d. William Parsons' observation and description of their spiral structure e. Harlow Shapley's observations of their radio spectrum