If electrons were positive and protons were negative, Coulomb's law would be written
A) the same.
B) somewhat differently.
C) very differently.
Answer: A
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A thin metallic shell of radius 40 cm has a charge of -25 nC on it. At the center of the sphere is a point charge of 35 nC. What is the electric field 15 cm from the center of the shell?
a. 
b. 
c. 
d. 
e. 
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Vectors 
and 
have equal magnitudes. Which statement is always true?
A.
+ = 0B.
- = 0C.
is perpendicular to + .D.
is perpendicular to+.E.
+ equals the magnitude of .According to the nuclear energy curve, would fusion or fission or neither release nuclear energy from gold [atomic number 79], and why?
A) Fission, because then the reaction products have higher atomic numbers and thus a higher nuclear energy. B) Fusion, because then the reaction product has a higher atomic number and thus a lower nuclear energy. C) Fission, because then the reaction products have lower atomic numbers and thus a lower nuclear energy. D) Neither, because all other elements have higher nuclear energies than carbon. E) Fusion, because then the reaction product has a lower atomic number and thus a higher nuclear energy.
In a He-Ne laser, the actual emission line at 632.8 nm comes from a jump down in what atom(s)?
A) neon B) helium C) helium and neon D) oxygen E) hydrogen