Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.3 MV
B) 2.9 MV
C) 3.5 MV
D) 7.8 MV
B
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A mirage occurs when light travels faster
A) near the ground than higher up. B) in less dense air than more dense air higher up. C) both of these D) neither of these
Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
A. 2.0 A B. 1.0 A C. 3.0 A D. 9.0 A E. 1.5 A
What is the total energy stored in the group of capacitors shown if the charge on the 30-?F capacitor is 0.90 mC?
A. 29 mJ B. 61 mJ C. 21 mJ D. 66 mJ E. 32 mJ
The Manicouagan reservoir near Quebec is an example of
A) a volcanic event. B) Earth's interaction with a comet's dust tail. C) cometary debris. D) a micrometeorite impact. E) a large meteorite impact.