Clicker Questions for NEXUS/Physics
Electric Fields
in Matter
These graphs show the electric potential outside a uniformly
charged plane (membrane) as a function of distance away
from the plane. Both curves represent measurements of
electric field magnitude in an ionic solution, and both
represent the same concentration of ions, but they are at
different temperatures. Which of the following explains
which curve is which?
A. The blue curve represents a solution
at higher temperature.
B. The red curve represents a solution
at higher temperature.
C. We can't determine anything about
temperature from this
graph. Temperature has no effect
on electric field, so there must be
some other factor causing the two
curves to be different.
D. None of these.
These graphs show the electric potential outside a
uniformly charged plane (membrane) as a function of
distance away from the plane. Both curves represent
measurements of electric potential in an ionic solution.
The graphs represents the electric potential in two
solutions at the same temperature, with different
concentrations of ions. Which curve is which?
A. The blue curve represents a
solution with greater
concentration of ions.
B. The red curve represents a
solution with greater
concentration of ions.
C. We can't determine anything
about the concentration of ions
from this graph.
D. None of these.
These graphs show the electric potential outside two
uniformly charged planes (membrane) as a function of
distance away from the plane. Both curves represent
measurements of electric potential in an ionic solution.
Which curve has the greater Debye length?
A. The solution represented by the
blue curve has a greater Debye
length.
B. The solution represented by the
red curve has a greater Debye
length.
C. Both have the same Debye
length.
D. We don't have enough
information to determine the
Debye length.
In an ionic solution with a smaller Debye length,
which of these effects will happen?
a) Like-charged objects have a greater tendency to repel
b) Like-charged objects have a smaller tendency to repel
c) Oppositely charged objects have a greater tendency
to attract
d) Oppositely charged objects have a smaller tendency
to attract
•
•
•
•
a only
b only
c only
d only
5.
6.
7.
8.
9.
a&c
a&d
b&c
b&d
none of these