A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. As the magnet leaves the wire, the induced current (as viewed from above):
a. is clockwise.
b. is counterclockwise.
c. is zero.
d. is along the length of the magnet.
b
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The maximum mass of a white dwarf is
A) about the mass of our Sun. B) limitless; there is no theoretical limit to the maximum mass of a white dwarf. C) about 3 times the mass of our Sun. D) about 1.4 times the mass of our Sun.
The electric potential at two points in space is: V1 = 200 volts and V2 = 300 volts. Which of the following statements is true for moving a point charge q from point 1 to 2?
A. The work done by an external agent to move q from point 1 to 2 is positive. B. We can't determine the work done because we don't know the direction of V at the two points. C. The work done by the electric force exerted on q in moving it from point 1 to 2 is W = –q(100 V).
1.A 2.B 3.C 4.A and B 5.A and C 6.B and C 7.A, B, and C 8.None of the aboveA nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3 . What is the magnitude of the potential difference between the center and a point 4.0 cm away?
a. 12 V b. 6.8 V c. 3.0 V d. 4.7 V e. 2.2 V
A particle moves along a path and its speed increases. In which of the following cases are its acceleration and velocity vectors parallel?
1.when the path is a parabola 2.when the path is straight 3.when the path is circular 4.never