Download 1) The energy required to move one elementary charge through a

1) A positively charged glass rod attracts object
X. The net charge of object X
a) may be zero or negative
b) may be zero or positive
c) must be negative
d) must be positive
2) What is the net electrical charge on a
magnesium ion that is formed when a
neutral magnesium atom loses two
electrons?
a) –3.2 × 10^–19 C
b) +1.6 × 10^–19 C
c) –1.6 × 10^–19 C
d) +3.2 × 10^–19 C
8) Which graph best represents the
electrostatic force between an alpha particle
with a charge of +2 elementary charges and
a positively charged nucleus as a function of
their distance of separation?
a)
b)
c)
d)
3) If the charge on each of two small charged
metal spheres is doubled and the distance
between the spheres remained fixed, the
magnitude of the electric force between the
spheres will be
a) the same
c) ½ as great
b) twice as great
d) 4 times as great
4) An electroscope has been positively charged
so the flaps are up. Then a positively charged rod
is brought near the top of the electroscope
without touching. Will the flap
9) In the diagram below, P is a point near a
negatively charged sphere.
Which vector best represents the direction of
the electric field at point P?
a) remain the same
b) open up even more
c) will go down
5) A particle with a charge of 2.5x10^-6 move
from point A to point B. There is an Electric
field between A and B. 6.3x10^-4 J of work is
required to move the charged particle from A to
B. What is the potential difference between
point A and B?
a) 1.6x10^-9 V
c) 2.5x10^2 V
b) 4.0x10^-3 V
d) 1.0x10^14 V
6) Oil droplets may gain electrical charges
as they are projected through a nozzle.
Which quantity of charge is not possible on
an oil droplet?
a) 8.0×10^–19 C
b) 3.2 × 10^–19 C
c) 4.8 × 10^–19 C
d) 2.6 × 10^–19 C
7) If an object has a net negative charge of
4.0 coulombs, the object possesses
a) 6.3 × 10^18 more electrons than protons
b) 2.5 × 10^19 more electrons than protons
c) 6.3 × 10^18 more protons than electrons
d) 2.5 × 10^19 more protons than electrons
10) Identical Sphere A and B has a charge of
-3x10^-6 C. Both spheres were brought into
contact the separated. The charge on sphere
A is
a) 0 C
b) +3x10^-6 C
c) -3x10^-6
d) -6x10^-6 C
11) A spring with a spring constant of 4.0
N/m is compressed by a force of 1.2N. What
is the total elastic potential energy stored in
this compressed spring?
a) 0.18 J
b) 0.60 J
c) 0.36 J
d) 4.8 J
12) Centripetal force Fc acts on a car going
around a curve. If the speed of the car were
twice as great, the magnitude of the
centripetal force necessary to keep the car
moving in the same path would be
a) Fc
c) 2Fc
b) Fc/2
d) 4Fc
13) A positively charged rod is held
near, but does not touch, a neutral
electroscope. The flap goes up
17) A skater increases her speed uniformly
from 2.0 meters per second to 7.0 meters per
second over a distance of 12 meters. The
magnitude of her acceleration as she travels
this 12 meters is
a) 1.9 m/s^2
b) 2.4 m/s^2
c) 2.2 m/s^2
d) 3.8 m/s^2
18) What is the electrostatic force between 2
protons which are separated by a distance of
1.0x10^-6 meters?
a) 2.3x10^-16 N; repulsive
b) 2.3x10^-16 N; attractive
c) 9.0x10^21 N; repulsive
d) 9.0x10^21 N; attractive
Charge on the top becomes
a) + and the flap becomes +
b) – and the flap becomes –
b) + and the flap becomes –
d) – and the flap becomes +
14) The energy required to move one
elementary charge through a potential
difference of 5.0 volts is
a) 8.0 J
b) 5.0 J
c) 8.0x10^-19 J
d) 1.6x10^-19J
19) Two protons are located one meter apart.
Compared to the gravitational force of
attraction between the two protons, the
electrostatic force between the protons is
a) stronger and repulsive
b) weaker and repulsive
c) stronger and attractive
d) weaker and attractive
20) The diagram below shows two
identical metal spheres, A and B,
separated by distance d. Each sphere has
mass m and possesses charge q
15) How much electrical energy is required
to move a 4.00-microcoulomb charge
through a potential difference of 36.0 volts?
a) 9.00 × 10^6 J
b) 1.44 × 10^–4 J
c) 144 J
d) 1.11 × 10^–7 J
16) A beam of electrons is directed into the
electric field between two oppositely
charged parallel plates, as shown in the
diagram below.
The electrostatic force exerted on the
electrons by the electric field is directed
a) toward the bottom of the page
b) toward the top of the page
c) into the page
d) out of the page
Which diagram best represents the
electrostatic force Fe and the
gravitational force Fg acting on sphere B
due to sphere A?
21) The diagram below shows three neutral
metal spheres, x, y, and z, in contact and on
insulating stands.
Which diagram best represents the charge
distribution on the spheres when a positively
charged rod is brought near sphere x, but
does not touch it?
a)
b)
c)
d)
Long Questions
1) The centers of two small charged particles are separated by a distance of 1.2 × 10^–4
m.
The charges on the particles are +8.0 × 10–19 coulomb and +4.8 × 10–19 coulomb,
respectively.
a) Calculate the magnitude of the electrostatic force between these two particles. [Show
all work, including the equation and substitution with units.]
b) Sketch a graph showing the relationship between the magnitude of the electrostatic
force between the two charged particles and the distance between the centers of the
particles.
c) On the diagram, draw at least four electric field lines in the region between the two
positively charged particles.
2) A projectile is fired from the ground with an initial velocity of 250. meters per second
at an angle of 60.° above the horizontal.
a) Determine at what time will the projectile reach its peak?
b) Determine the horizontal component of the initial velocity.
c) Explain why the projectile has no acceleration in the horizontal direction. [Neglect air
friction.]