Quarks have electric charges of magnitude
a. e
b. 1/3 e
c. 2/3 e
d. 0
e. none of the above
B, C
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A lens is used as a magnifier. Which of the following statements is incorrect?
a. The focal length of the lens must be negative. b. The magnification is greatest when the eye focuses at the near point. c. The refractive power of the lens is positive. d. The lens is convex.
Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies
Indicate whether the statement is true or false
Two wires, one copper and the other steel, of equal length stretch the same amount under an applied load P. The moduli of elasticity for each is Es 5 210 GPa and Ec 5 120 GPa. The ratio of the diameter of the copper wire to that of the steel wire is approximately:
(A) 1.00
(B) 1.08
(C) 1.19
(D) 1.32
A current-carrying loop of wire experiences no tendency to rotate in a magnetic field when
A) field lines pass directly through the loop. B) no field lines pass through the loop. C) none of these