Fiji National Which Are the Units of The Coulombs Constant K Physic Lab Report

Simulator: https://phet.colorado.edu/en/simulation/coulombs-law
Explaining simulator: https://youtu.be/GgHTWJ7f698
Video about using Microsoft Excel to find the equation of a data set:

Lab – Coulomb’s Law
Question 1
20 Points
The Coulomb’s force is calculated using the formula below
K is the Coulomb’s constant.
a) What is the value of the Coulomb’s constant, K?
b) Which are the units of the Coulomb’s constant, K?
c) What the variables q1 and q2 represent?
d). Which is the unit of q1 and q2?
e) What the variable r represents?
f) Which is the unit of r?
1.
Question 2
10 Points
Based on the formula of the Coulomb’s force
a) How the force F changes, when q1 is doubled?
b) How the force F changes when r is doubled?
c) Write the formula of the Coulomb’s force if q1 = q2 = q (formula in terms of q)
2.
Question 3
20 Points
Open the simulation.
Click on Macro Scale
If the values of q2 and r do not change, and q1 is changed. Complete the table with the values of
the forces acting on the particles, and the direction of the forces. (Fill the table and upload a
picture)
Observe the behavior of the forces, with the change of q1, and describe it.
3.
Question 4
20 Points
If the values of q1 and r do not change, and q2 is changed. Complete the table with the values of
the forces acting on the particles, and the direction of the forces. (Fill the table and upload a
picture)
Observe the behavior of the forces, with the change of q2, and describe it.
4.
Question 5
20 Points
If the values of q1 and q2 do not change, and r is changed. Complete the table with the values of
the forces acting on the particles, and the direction of the forces. (Fill the table and upload a
picture)
Observe the behavior of the forces, with the change of r, and describe it.
5.
Question 6
10 Points
The equation of a line that pass through the origin is y = mx (in slope – intercept form). Where m
is the slope, x is the independent variable and y is the dependent variable.
In Question 3 (table 1), the Force between the particles is the dependent variable (y) and q1 is
the independent variable (x), so the expression
is equivalent to the slope of the line.
Using the values of q1 and Force of table 1, and using Microsoft Excel, graph q1 vs Force (q1 is x
axis and Force is y axis). (Upload a picture of the graph as part of your answer)
a) What is the slope of the line obtained using Microsoft Excel?
b) If Slope =
, taking q2 = 8
(micro Coulomb) and r = 3 cm (centimeters), find the
value of the Coulomb’s constant K
K=
You must convert the units as needed:
c) Is the value of the Coulomb’s constant, determined by you (experimental value), similar to the
accepted or theoretical value of the constant (value you mention in question 1)?
d) Calculate the percentage of error between the theoretical and experimental values of the
Coulomb’s constant, using the expression below:

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