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Clicker Questions for NEXUS/Physics
Electric Forces
and Fields
A.
B.
C.
D.
E.
F1→3 is twice as big as F2→3.
F1→3 is half as big as F2→3.
F1→3 is more than twice as big as F2→3.
F1→3 is less than half as big as F2→3.
F1→3 doesn’t affect q3 at all since q2 is
in the way.
NEXUS/Physics Clicker Questions
Three identical charges are lined up in a row.
If we compare the electric force charge q1
exerts on charge q3 (F1 →3) to the force q2
exerts on charge q3 (F2→3)
A.
B.
C.
D.
E.
A
B
C
D
You can’t tell.
NEXUS/Physics Clicker Questions
In the figure are shown four arrangements
of charge. Each charge has the same magnitude,
but some are + and some are -. All distances
are to the same scale. In which would
the magnitude of the force felt by
a positive test charge placed at P be the largest?
In the figure each of the red charges are positive
and have the same magnitude. In which of the
diagrams would the magnitude of the force felt by a
positive test charge placed at P be the largest?
A.
B.
C.
D.
Case 1
Case 2
Both are the same
You can’t tell
A.
B.
C.
D.
E.
16F
4F
F
F/4
other
NEXUS/Physics Clicker Questions
Two small objects each with a net charge
of Q (positive) exert a force of magnitude F
on each other. We replace one of the objects
with another whose net charge is 4Q. The original
magnitude of the force on the Q charge was F;
what is the magnitude of the force on the Q now?
1.
2.
3.
4.
They would stay the same
Both would reverse
Only the left force would reverse
Only the right force
would reverse
5. Something else
NEXUS/Physics Clicker Questions
In the original state we assumed Q was
positive. If the symbol Q were taken to have
a negative value, how would the forces
change compared to the original state?
1.
2.
3.
4.
FA®q
FB®q + FC®q
FA®q + FB®q + FC®q
There is not enough
information to tell.
NEXUS/Physics Clicker Questions
A test charge (labeled q) is placed in a
situation in which it feels the electrical force
from three other charges (of opposite sign to it)
labeled A, B, and C. (The charges are on
a uniform grid as shown and the positions are
to scale.) Which of the following combinations
of forces is the greatest?
Two identical conductors hang from
nonconducting strings. They are given
charges q1 = Q and q2 = 3Q.
After charging, the two strings make
angles of θ1 and θ2 with the vertical.
How do the angles compare?
1.
2.
3.
4.
θ1 > θ 2
θ1 < θ 2
θ1 = θ 2
You don’t have
enough information
to tell.
1.
2.
3.
4.
5.
6.
7.
8.
Case 1
Case 2
Case 3
Case 4
Cases 1 & 2
Cases 1 & 3
Cases 2 & 4
Cases 3 & 4
NEXUS/Physics Clicker Questions
In each of the four cases shown below, a particle
of charge +q is placed a distance d from a particle of
charge +4q. The particles are then released simultaneously.
The masses of the particles are indicated in the diagram.
Rank the magnitude of the acceleration of the RIGHT HAND
particle just after it is released.
A. Depends only on the magnitude of the test
charge used to measure it.
B. Depends only on the sign of the test
charge used to measure it.
C. Depends on both the sign and magnitude
of the test charge used to measure it.
D. Does not depend on the test charge used
to measure it.
E. None of the above.
NEXUS/Physics Clicker Questions
The electric field at a particular point
in space
A test charge, q, is a distance d from a
charge Q as shown. It feels an electric field, E0.
A.
B.
C.
D.
E.
F.
Change to -3E0
Change to -E0/3
Not change
Change to 3E0
Change to E0/3
Something else
NEXUS/Physics Clicker Questions
If q were replaced by a charge –3q,
the electric field it feels would