The electric potential inside a charged solid spherical conductor in equilibrium
A. is always zero.
B. is constant and equal to its value at the surface.
C. decreases from its value at the surface to a value of zero at the center.
D. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface.
E. is equal to the charge passing through the surface per unit time divided by the resistance.
Answer: B
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Imagine that our Sun were magically and suddenly replaced by a black hole of the same mass (1 solar mass). What would happen to Earth in its orbit?
A) Earth would almost instantly be sucked into oblivion in the black hole. B) Nothing; Earth's orbit would remain the same. C) Earth would slowly spiral inward until it settled into an orbit about the size of Mercury's current orbit. D) Earth would orbit faster, but at the same distance.
A nonuniform linear charge distribution given by ?(x) = bx, where b is a constant, is distributed along the x axis from x = 0 to x = +L. If b = 40 nC/m2 and L = 0.20 m, what is the electric potential (relative to a potential of zero at infinity) at the point y = 2L on the y axis?
a. 19 V b. 17 V c. 21 V d. 23 V e. 14 V
Suppose an object is hanging from the end of a spring. Let the spring’s length when the object is hanging at rest be L. Now suppose we pull the object downward until the spring has been stretched a length of 2L. By what factor has the force that the spring is exerting on the object increased?
A. The spring force is the same in both cases.
B. 
times stronger
C. 2 times stronger
D. 4 times stronger
E. The answer depends on the spring’s relaxed length.
What direct evidence do we have that the weak and electromagnetic forces were once unified as a single force?
A) Particle accelerators on Earth can reach energies equivalent to the high temperatures of the Electroweak era and have produced particles predicted by the unified theory. B) Detectors on Earth have received photons and high-energy particles from the GUT era. C) The most advanced telescopes are able to see back to the GUT era in the universe. D) Temperatures in the center of the Sun can reproduce the conditions during the Electroweak era. E) We have no direct evidence of such a unified force.