A dielectric material such as paper is inserted between the plates of a capacitor as the capacitor holds a fixed charge on its plates. What happens to the electric field between the plates as the dielectric is inserted?
A) There is no change in the field.
B) The field becomes stronger.
C) The field becomes weaker.
D) The field reduces to zero.
C
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How do we know that there are intergalactic clouds between a distant quasar and us?
A) We see hydrogen emission lines at redshifts smaller than that of the quasar. B) We see hydrogen absorption lines at redshifts smaller than that of the quasar. C) We see hydrogen emission lines at redshifts greater than that of the quasar. D) We see hydrogen absorption lines at redshifts greater than that of the quasar. E) We see that the emission lines from the quasar are lessened by intervening gas and dust.
The index of refraction of a certain medium is 1.5. What is the speed of light in that medium?
A) 1.0 × 108 m/s B) 2.0 × 108 m/s C) 3.0 × 108 m/s D) 4.0 × 108 m/s E) 5.0 × 108 m/s
The most significant difference between the astronomical theories of Ptolemy and Copernicus is
A) Ptolemy's is not based on scientific evidence, while Copernicus's is. B) Ptolemy's theory does away with many of the complexities of the Copernican theory. C) Ptolemy's theory is sun-centered, whereas Copernicus's is Earth-centered. D) Ptolemy uses circular planetary orbits while Copernicus uses elliptical orbits. E) Ptolemy's theory is Earth-centered, whereas Copernicus's is sun-centered.
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The period of the electromagnetic oscillations in the circuit is
A. 0.0227 s. B. 0.377 s. C. 2.26 s. D. 105 s. E. 1750 s.