A sustained electric current can be achieved with a
A) generator.
B) battery.
C) both
D) none of the above
Answer: C
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A charge of 40 pC is distributed on an isolated spherical conductor that has a 4.0-cm radius. Point A is 1.0 cm from the center of the conductor and point B is 5.0 cm from the center of the conductor. Determine the electric potential difference VA?VB.
A. +1.8 V B. +29 V C. +27 V D. +7.2 V E. +9.0 V
Three resistors connected in parallel have the individual voltages labeled ?V1, ?V2 and ?V3, respectively. Which of the following expresses the total voltage ?VT across the three resistors when connected in this manner?
a. ?VT = ?V1 + ?V2 + ?V3 b. ?VT = (1/?V1 + 1/?V2 + 1/?V3) c. ?VT = ?V1 = ?V2 = ?V3 d. ?VT = (1/?V1 + 1/?V2 + 1/?V3)?1
Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror?
a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one
The Galilean moon of most interest to exobiologists is
A) Ganymede. B) Europa. C) Io. D) Amalthea. E) Callisto.