Gauss's Law: The figure shows four Gaussian surfaces surrounding a distribution of charges.(a) Which Gaussian surfaces have an electric flux of +q/?o through them?(b) Which Gaussian surfaces have no electric flux through them?
What will be an ideal response?
(a) surface b (b) surface c
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Within a given system, the internal forces
A. are always balanced by the external forces. B. all add to zero. C. are only determined by subtracting the external forces from the net force on the system. D. determine the motion of the system. E. are measured with a gravimeter.
Consider an object in orbit around a star. The star suddenly shrinks in size, but does not change its mass. What happens to the object's orbit?
A) It is instantly ejected from its orbit. B) It remains in the same orbit. C) It settles into a smaller orbit, with similar distance from the surface as the original orbit. D) It gradually spirals into the star.
Dispersing light that has traveled from a hot wire through a cool gas gives what type of spectrum?
a. Line absorption b. Continuous c. Line emission d. Ultraviolet
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ