Impedance: What resistance is needed in series with a 10-?F capacitor at 1.0 kHz for a total impedance of 45 ??
A. 29 ?
B. 42 ?
C. 61 ?
D. 1.8 ?
Answer: B
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A battery charges a parallel-plate capacitor fully and then is removed. The plates are immediately pulled apart. (With the battery disconnected, the amount of charge on the plates remains constant
) What happens to the potential difference between the plates as they are being separated? A) It decreases. B) It increases. C) It remains constant. D) There is no way to tell from the information given.
A(n) ______________ moon occurs when more than one-half of the Moon's surface appears illuminated
Fill in the blank(s) with correct word
Superconductivity is lost when a certain __________ is exceeded
Fill in the blank(s) with correct word
A moon is in orbit around its mother planet. Which of the following statements is always true about its kinetic energy (K), and its gravitational potential energy (U)?
A) K is negative, and U is negative. B) K is negative, and U is positive. C) K is positive, and U is negative. D) K is positive, and U is positive.