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1. We would like to use the
induction method
to negatively charge one of the isolated
copper spheres used in the lecture demonstrations. Consider the following procedural
steps:
(1) attach a ground wire to the sphere
(2) remove the ground wire from the sphere
(3) touch a negatively charged rod to the sphere
(4) bring a + charged rod near, but not touching, the sphere
(5) remove the charged rod
To charge the copper sphere by induction, one can use the sequence of steps:
A) 3, 5
B) 1, 4, 5, 2
C) 4, 1, 5, 2
D) 4, 1, 2, 5
E) 3, 1, 2, 5
2. The diagrams below depict four different charge distributions.
The charged particles are
all the same distance from the origin.
Rank the distributions by the
electric potential V
at the origin,
from lowest to highest
potential
.
(Take V=0 at infinity in each case)
A) 2, 3, 1, 4
B) 4, 3, 2, 1
C) 3, 1, 4, 2
D) 1, 3, 2, 4
E) 1, 4, 2, 3
3. A point charge of 8 μ
C
is placed on the x axis at x=2.0 meters.
Where on the x axis in
meters should we place a point charge of 2.0 μ
C
so that the total force on a third point
charge at the origin (x=0) is zero?
A) 0.5 m
B) 2.0 m
C) 1.0 m
D) 0.5 m
E) 1.0 m
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4. A dipole is released from rest near an isolated point charge.
Describe its subsequent
motion.
Point
charge
P
A) It begins to rotate and moves away from the point charge
B) It begins to rotate and moves toward the point charge
C) It does not rotate and it does not translate
D) It does not rotate but it does move away from the point charge
E) It does not rotate but it does move toward the point charge
5. A charged oil drop with a mass of 2 × 10
–4
kg is held suspended by a downward electric
field of 300 N/C. The charge on the drop is:
A) +6.5 × 10
–6
C
B) –6.5 × 10
–6
C
C) –1.5 × 10
–6
C
D) 0
E) +1.5 × 10
–6
C
6. An insulator in the shape of a sphere with radius R has positive charge uniformly
distributed throughout its volume. If the zero of electric potential is taken to be at
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This note was uploaded on 10/14/2009 for the course CHEM 130 taught by Professor Jadwigasipowska during the Fall '07 term at University of Michigan.
 Fall '07
 JadwigaSipowska
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