Question

1.
It is Friday night and Dr. J's classroom is full of eager young
students. Yes, it's the weekly meeting of the Wizards of Oz, a club
for bright preteens interested in science. This particular night is
even more special because new members will be officially received
into the club. Dr. J had been attracted to the group over a year
ago and, after rubbing shoulders with the youngsters, his interest
was sparked. His attitude grew more positive over the following
months when he saw the tremendous potential associated with their
capacity to learn. Being charged with the responsibility of this
induction ceremony, Dr. J has decided to use electrostatics as the
theme of the evening. Each student is given an experiment to run in
order to demonstrate the skills necessary for membership. Having
left his patches of wool at home by mistake, Dr. J instructs
everyone to use Tripod as their charge cloth. The fur only flies
once as Tripod is rubbed the wrong way. (He takes a negative view
of his role.) Perhaps the toughest experiment is the one given to
the incoming president. Having been told to weigh the pros and cons
of pith balls, he has charged two of them equally. They are 3 cm
apart and are repelling each other with a force of 4 x
10 |

2. Which is more dangerous, touching a faulty 110-volt light bulb or a Van de Graaff generator charged to 100,000 volts? Why? Give a detailed elaborate answer.

3.
Calculate the size of the force that would be experienced by a 3.0
µC charge placed into a uniform electric field of strength 1.0 x
10^{5} N/C.

4. A – 5.0 mC charge travels due south under the influence of a 10 N force when placed into a uniform electric field. What force would a 10 mC charge experience if placed in the same field and in which direction would it move?

5. What is the magnitude of a point charge that would create an electric field of 1.00 N/C at points 1.00 m away?

6. Consider a fixed point charge of +2.00 ?C. What is the magnitude and direction of the electric field at a point P, a distance of 0.100 m away?

7. An electric field has an electric field strength 6000. N/C at a distance of 1.5 m. What is the strength of the field at a distance of 6.0 m?

8. 24. An alpha (?) particle is positioned in an electric field such that the gravitational force acting on it is equal to the electrostatic force.

(q_{?} = 3.2 x 10^{–19} C and m_{?} = 6.64
x 10^{–27} kg)

a) What is the direction of the electric field at this point?

b) What is strength of the electric field?

c) If the field is located 0.25 m away, what is the magnitude of the charge?

9. Determine the potential at a point 0.50 m from a 20. µC point charge.

10. An electric field is parallel to the x-axis. What is the magnitude and direction of the electric field if the potential difference between x = 1.0 m and x = 2.5 m is found to be +900 V?

11. A charged droplet of
mass 5.88 x 10^{–}^{10} kg is hovering motionless
between two parallel plates. The parallel plates create have a
potential difference of 24000 V and are 2.00 mm apart. What is the
charge on the particle?

Answer #1

An electric field has an electric field strength 6000. N/C at a
distance of 1.5 m. What is the strength of the field at a distance
of 6.0 m?
24. An alpha (α) particle is positioned in an electric field
such that the gravitational force acting on it is equal to the
electrostatic force.
(qα = 3.2 x 10–19 C and mα = 6.64
x 10–27 kg)
a) What is the direction of the
electric field at this point?...

24. An alpha (α) particle is positioned in an electric field
such that the gravitational force acting on it is equal to the
electrostatic force.
(qα = 3.2 x 10–19 C and mα = 6.64
x 10–27 kg)
a) What is the direction of the
electric field at this point?
b) What is strength of the electric
field?
c) If the field is located 0.25 m
away, what is the magnitude of the charge?
Determine the potential at a...

1) In the figure, charge q 1 = 2.7
× 10-6 C is placed at the origin and charge
q 2 = -4.9 × 10-6 C is placed on the
x-axis, at x = -0.20 m. Where along the positive
x-axis can a third charge Q = -8.3 µC be placed
such that the resultant force on this third charge is zero?
2) What magnitude charge creates a 8.00 N/C electric field at a
point 3.30 m away?

Consider an infinite plane of charge with a charge density of
+10 µC/m2. Assume that this plane is on the y-and
z-axes. That is, assume it is perpendicular to the x-axis and that
it passes through the origin.
a) What would be the electric field strength and direction at
the point (5 m, 0, 0)?
The strength is___________N/C
The direction is Answer: -x, x, -y, y, -z, or z
b) What would be the electric field strength and direction at...

Point charges of 28.0 µC and 43.0 µC are placed 0.500 m
apart.
(a) At what point along the line connecting them is the electric
field zero?
How are the electric fields due to each charge related? How can you
put the two distances in terms of one distance? m (from the smaller
charge)
(b) What are the magnitude and direction of the net electric field
halfway between them?
magnitude
N/C
direction
---Select--- toward the smaller charge toward the larger...

GOAL Use the superposition principle to calculate the electric
field due to two point charges. Consider the following
figure.
The resultant electric field at P equals the
vector sum 1 + 2, where 1 is the
field due to the positive charge q1and
2 is the field due to the negative charge
q2.Two point charges lie along the
x-axis in the x y-coordinate plane.
Positive charge q1 is at the origin, and
negative charge q2 is at (0.300 m, 0). Point...

A 5.1-µC point charge is located at x = 1.1 m,
y = 2.9 m, and a -4.4-µC point charge is located at
x = 1.9 m, y = -2.3 m.
(a) Find the magnitude and direction of the electric field at
x = -3.3 m, y = 1.1 m.
magnitude
kN/C
direction
°
(b) Find the magnitude and direction of the force on a proton at
x = -3.3 m, y = 1.1 m.
magnitude
N
direction
°

A 4.6-µC point charge is located at x = 1.1 m, y = 2.8 m, and a
-4.3-µC point charge is located at x = 2.3 m, y = -2.3 m.
(a) Find the magnitude and direction of the electric field at x
= -3.3 m, y = 0.9 m.
magnitude .....................kN/C
direction ........................°
(b) Find the magnitude and direction of the force on a proton at
x = -3.3 m, y = 0.9 m.
magnitude .................................N
direction............................ °

A proton is acted on by an uniform electric field of magnitude
443 N/C pointing in the negative x direction. The particle
is initially at rest.
(a) In what direction will the charge move?
---Select--- +x direction ?x direction +y direction ?y direction +z
direction ?z direction
(b) Determine the work done by the electric field when the particle
has moved through a distance of 3.15 cm from its initial
position.
J
(c) Determine the change in electric potential energy...

Three point charges, A = 2.35 µC, B = 7.40 µC, and C = −3.85 µC,
are located at the corners of an equilateral triangle as in the
figure above. Find the magnitude and direction of the electric
field at the position of the 2.35 µC charge. magnitude N/C
direction ° below the +x-axis (b) How would the electric field at
that point be affected if the charge there were doubled? 1)The
magnitude of the field would be halved. 2)The...

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