Potential of Point-Charges: The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of +Q is located at one of the corners of the square. What is the potential (relative to infinity) at the center when each of the other corners is also contains a point charge of +Q?
A. 0 V
B. 3.0 V
C. 9.0 V
D. 12 V
Answer: D
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A. 4.4 × 10-14 N B. 1.6 × 10-15 N C. 5 × 10-20 N D. 2.6 × 10-24 N E. zero
Which of these devices helps correct coma in fast reflectors?
A) Cassegrain secondary mirror B) star diagonal C) achromatic doublet D) Schmidt corrector plate E) Newtonian secondary mirror
The basic function of the electric generator is which of the following conversion processes?
a. mechanical energy to electrical b. electrical energy to mechanical c. low voltage to high or vice versa d. alternating current to direct
Aluminum is an example of
a. a compound. b. a solution. c. an element. d. an alloy.