If a negative charge is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:
a. both the inner and outer surfaces will become negative.
b. both the inner and outer surfaces will remain neutral.
c. the outside surface of the conductor will become positively charged. d. the inside surface of the conductor will become positively charged.
D
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A 500-W device is connected to a 100-V power source. What current flows through this source?
A) 50,000 A B) 200. mA C) 5.00 A D) 20.0 A E) 1.60 × 1018 electrons/s
Three identical balls are thrown from the top of a building, all with the same initial speed. The first ball is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal as in the figure below. Neglect air resistance, rank the speeds of the balls as they reach the ground, from fastest to slowest
As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity
directed to the right. Judd says that the emf induced in the loop is zero. Roger claims that it has magnitude 
. Which one, if either, is correct, and why?
?
?
?
a.
Judd, because the magnetic flux through the loop is constant.
b.
Roger, because the magnetic flux through the loop is constant.
c.
Judd, because the magnetic flux through the loop is not constant if 
.
d.
Roger, because the magnetic flux through the loop is not constant if 
.
e.
Roger, because the magnetic flux through the loop is ?B = 0.