Potential of Point-Charges: Two 5.0-µC point charges are 12 cm apart. What is the electric potential (relative to infinity) of this combination at the point where the electric field due to these charges is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.75 MV
B. 1.5 MV
C. 0.0 MV
D. 25 MV
E. 12.5 MV
Answer: B
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A. 2.98 
B. 3.92
C. 5.88
D. 6.86
E. 7.84
A uniform linear charge density of 7.0 nC/m is distributed along the y axis from y = 2 m to y = 5 m. Which of the following integrals is correct for the magnitude (in N/C) of the electric field at y = 0 on the y axis?
A.
B.
C.
D.
E.
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a. Bohr. b. Thomson. c. Dalton. d. Rutherford.
An astronaut falling into a black hole would see the universe
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