Performing this experimentation will allow one to investigate the relationship quantitative relationship between the electrostatic force and the distance between charged objects. First a simply observation was made of the electrical forces on two pieces of tape taking note of their attraction and repulsion. This same phenomenon was observed in the experimentation of two charged spheres. Furthermore the we used this experimentation to determine the magnitude of the electrical force between charged objects through video analysis. Derived from our data we have resulted that the forced acting is dependent upon the distance for the forces to act at an exponential rate of .04microcoulombs.

OBJECTIVE
We will note coulombs law by observing examination of forces in static equilibrium to determine the magnitude of the electrical force between charged objects. PROCEDURE
Using the Logger Pro we track the electrostatic force between two charged spheres and the magnitude generated by the repulsion.

RESULTS
Data was not signed but sent to Doctor Wijesinghe upon completion in lab with analysis of results found. Synopsis sent was agreed to by all lab members.

DATA ANLYSIS
From the data gather we seen that the force generated increases exponentially at rate of 0.04microcoulombs. The intial data was to dissect the distance the spheres moved due the forces acting upon them in by allowing X to be the hanging sphere and X2 to be the probing sphere in a distance field in of 1m. To calculate this value the following equations were used: Fe=Kq1xq2/r2

Abs(X)-Abs(X2)= CC
Fe=mg sin∂
sin∂=x/l
Fe=mgx/l
DISCUSSION
The force will be dependent upon the sizes of the charges, and their separation. In fact the force follows an inverse square law, and is very similar in form to Newton’s Law of Universal Gravitation. It is known as Coulomb’s law. The form is exactly the same as Newton’s law of universal gravitation; in...

...Riley Jefferson
Block 7/8
October 8th 2012
Electrostatic Gedanken Lab
Group Gamma
Objective: The objective of this lab is to determine the charge on a pith ball.
Hypothesis: I fully believe that the charge of the pith ball will be positive. The formula I will use to prove this is Coulomb’sLaw, (Fe=(k*q1*q2) / r²). ‘Fe’ is equal to the electrostatic force between the spheres, measured in Newton’s. It is also a vector quantity, and it’s in absolute value. Secondly, ‘k’ is equal to Coulomb’slaw constant. The constant is equal to 8.99 * 10^9 N*m²/C². Thirdly, ‘q1’ is equal to the charge in Coulomb’s (C) of the first object. As well, ‘q2’ is equal to the charge of the second object in Coulomb’s (C). Finally, ‘r²’ is equal to the radius between the two centres of the objects measured in metres, squared. The manipulated variable in this lab is the radius at which we place the metal sphere away from the pith ball. The responding variable is the electrostatic force of the pith ball as a result of the radius from the metal sphere. The controlled variable is the charge of the metal sphere, which is -3.59e-7C.
Equipment
1. Pith Ball
2. Metal Sphere: Has a charge of -3.59e-7C.
3. Spring Device: Measures force acting between the two spheres.
Procedure:
1. Make sure the pith ball is hanging insulated on the spring device, and that you have...

...Coulomb'sLaw
electrical force between 2 objects is proportional to the magnitude of their
charges & inversely proportional to the square of the distance between them
-k is Coulomb's constant
-q1 and q2 are the charges (measured in Coulombs; 1 Coulomb (C) = 6.3 x 1018 electrons)
-charge of a proton = e = 1.6 x 10-19 C; charge of an electron = -1.6 x 10-19 C
-r is the distance between charges along the same line
*Coulomb'sLaw applies only to point charges or particles & to spherical distributions of charges
-Fe is attractive if charges are of opposite sign
-Fe is repulsive if charges are of same sign
-Fe obeys Newton's 2nd & 3rd Laws of Motion
-Fe is a vector
Definition: Conductor -a material in which electric charges move freely
-i.e., copper, iron
Definition: Insulator -a material in which electric charges do not move freely
-i.e. plastic, rubber
Definition: Semiconductors -materials having electrical properties between those of conductors and insulators
-i.e. silicon, germanium
Definition: grounded -when a conductor is connected to the Earth by a conducting wire
Definition: induction (inducing a charge) -charging an object without coming into contact with it
Definition: conduction (conducting a charge) -charging an object through contact
Definition: field force -one exerted by object on another though no physical contact...

...Name: Section: SP1L-17 Date: 2/26/11
Coulomb’sLaw: What is the charge on a charged pith ball?
Experimental Determination of the Electrostatic Force acting between two charged pith balls
Equipment: a pvc pipe and fur or wool, a metric ruler, a protractor, two pith balls on a stand as in figure 1. Your teacher will tell you the mass of your pith balls.
Procedure: Make sure the strings of your two pith balls are untangled as in figure 1. Make sure that the pith balls are neutral by rubbing them with your finger. Measure the length from the point that the strings can pivot on the stand to the center of the ball and record it. Charge the pith balls according to the instructions given by your lab teacher. When the pith balls are fully charged alike (negative) they will noticeable repel each other.
figure 1 figure 2
[pic] [pic]
Use the protractor to measure the angle between the two strings.
|Length of the strings, (l) |Angle between the strings, (θ) |
|0.18 m |8 degrees |
When the pith balls have reached their final charged position and are at rest, what do we know about the forces acting on them?
Name the force: A B C
To...

...
Coulomb’sLaw
Purpose:
The purpose of this lab was to demonstrate that the force between two stationary charges is directly proportional to the product of the charges and inversely to the square of the distance between them. Coulomb'slaw tells us that the force between two charges depends (1) linearly on the strength of each charge, and (2) inversely on the square of the distance between them. Mathematically we would write this as .
Procedures
Part1
Begin by removing the right side guide block and setting it aside.
Inductively charge the sphere attached to the left side guide block by doing the following the
order of the steps is critical to success!
Rub the wool square on the white vinyl strip to transfer charge to the strip.
Bring the sphere on the guide block near to the charged strip but do not touch them
together. With the sphere close to the strip, touch the sphere with your finger and then
remove your finger. (When you touch it, you are acting as a ground – an escape route
for electrons.)
After you have removed your finger from the sphere pull the sphere away from the
charged strip. The sphere on the guide block should now be charged.
Note: If you hear a crack or pop sound while the strip is close to the sphere, this means
that they were too close to each other and...

...Course number: _________________
MAKE SURE TA & TI STAMPS EVERY PAGE BEFORE YOU START
Laboratory Section: ____________
Partners’ Names: ______________________
Last revised December 15, 2014
Grade: _______________________
Experiment 6
Coulomb’sLaw - PRELAB
0. Pre-lab Homework (2 points)
The pre-lab homework must be handed to the lab TA at the start of the lab.
1. Why is it important to recharge the spheres before each measurement?
2. Consider the function y = xn (for n = -2). Take the natural logarithm of both sides and plot
ln(y) vs. ln(x) on the graph below. Explain or show how to obtain “n” from the graph. (Hint:
Can you fit the graph below to a straight line?) (use x=1, 2, 3, 4, 5, 6)
TA or TI Signature ___________________________________ 1 of 13
Name___________________________________ Date: ________________ Course number: _________________
MAKE SURE TA & TI STAMPS EVERY PAGE BEFORE YOU START
Experiment 6
Coulomb’sLaw – THE EXPERIMENT
1. Purpose
The purpose is to verify the proportionality of Coulomb’sLaw, that is, to verify that the
electric force between two point charges is directly proportional to the product of the
charges and is indirectly proportional to the square of the distance between them.
2.1 Introduction
Coulomb’sLaw gives us the static electrical force F, exerted by point...

...Baños
6Department of Civil Engineering-CEAT, UP Los Baños
*Corresponding author:princesspi_poli@yahoo.com
ABSTRACT
This experiment showed how to map equipotential lines of charged bodies, specifically of a point charge and a line charge, and then determine the electric field. The data gathered during the experiment were plotted in a graph and analyzed. It proved that in a given electric field region, electric potential varies from one point to another and it is possible to locate points with the same potential. Field lines were drawn to show the direction and strength of field. The closer the lines, the stronger the force acts on an object.
Keywords: Electric Field, Potential Line, Voltmeter, Probe
1. Introduction
In Coulomb’sLaw, it explained the forces that charged objects apply to one another, but it does not explain how these forces mediated when the objects are not in contact. This is where the concept of field enters. We all know that objects with mass experiences a force whenever it is in a gravitational field or produced by another object with mass that made a contact with it. Gravitational field is a constant which pulls the object directly towards the center of the earth which means downward and perpendicular to the Earth’s surface.
Charges, like other objects, have mass too. Therefore, they also experience force by means of contacts with other charges or because of field. This is where the concept of electric...

...COULOMB’SLAW
INTRODUCTION
The magnitude of the force of attraction or repulsion between two electric charges at rest was studied by Charles Coulomb. He formulated a law, known as "COULOMB'SLAW".
STATEMENT
According to Coulomb'slaw:
The electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of charges.
The electrostatic force of attraction or repulsion between two point charges is inversely proportional to the square of distance between them.
MATHEMATICAL REPRESENTATION OF COULOMB'SLAW
Consider two point charges q1 and q2 placed at a distance of r from each other. Let the electrostatic force between them is F.
According to the first part of the law:
According to the second part of the law:
Combining above statements:
OR
---------------------(I)
Where k is the constant of proportionality.
VALUE OF K
Value of K is equal to 1/40 where o is permittivity of free space .Its volume is 8.85 x 10-12 c2/Nm2. Thus in S.I. system numerical value of K is 8.98755 x 109 Nm2c-2.
OTHER FORMS OF COULOMB'SLAW
Putting the value of K = 1/40 in equation (i)
FORCE IN THE PRESENCE OF DIELECTRIC MEDIUM
If the space between the charges is filled with...

...
Coulomb'sLaw
1. Objective - To study the validity of Coulomb’slaw on a simple electroscope. This will be split into two parts; first measuring the the force as a function of distance, and second we will look at how the magnitude and sign of the charges affect the force.
2. Theory- As is well known, like charges repel and opposite charges attract. That being said, the strength of those forces also depends on the distance between the two charges. By observing this force over countless experiments Charles-Augustin de Coulomb discovered an inverse square law relating the force between two charges to the distance between them. This relationship is described by the following equation:
Equation 1:
In this equation, and are the charges on point charges 1 and 2 and r is the distance between the two charges. The direction of the force in this special case is always along a straight line drawn between the two charges. Additionally, it is important to note that charge is conserved; it can be moved but cannot be created or destroyed. Specifically, in this lab, we will move the charges around to setup a test of Coulomb’slaw on a simple electroscope. As mentioned above, the experiment will be split into two parts, first measuring the force as a function of distance and then we...