Induction and Faraday’s
Thursday, October 25, 2012

Lab Report 6Introduction and Faraday’s Law

Objective: In this experiment, Faraday’s law of induction will be investigated.

Theory: Faraday’s law of induction states the induced emf or voltage in a coil is proportional to the rate of change of magnetic flux through a coil, this is shown blew:

Ƹ= -dɸ/dtEquation 6.1

The flux of the magnetic field is defined and the following:

ɸ=BAcosΘ Equation 6.2

B is the magnetic field at the location of the coil. A is the cross sectional area of the coil, and Θ is the angle between the field and the area A. There is several different ways to create a changing flux though the coil. An easy way is to use a magnet moving near the coil to change B passing through the coil. Another way is to change B is to use a magnetic field B using another coil. If the tne current in the primary coil is changed, then the magnetic field through the secondary or pick up coil changes inducing a voltage.

Procedure: Start by setting up Logger pro and attaching the required equipment. A) Use a compass to determine the north. Change the sample rate on logger pro to 20-30 samples in 5 seconds. Collect data while moving a magnet toward the coil. Repeat what just was done but move the magnet away from the coil. Compare the differences of the two runs. Then run a magnet to and from the side of the coil and observe what happens. B) Attach a sine wave generator to a 200 turn coil. Insert an AC ammeter rated to at least 2 Amps into the circuit to the monitor the current through the primary. Place the pickup coil at the center of the primary coil. Set sample rate to 1000 sample in 1 second. Collect several runs. Then turn the pick up coil sideways. Collect data and observe what happens.

Data

Graph 6.1: this graph shows a sample of the data for procedure A.

Graph 6.3: this graph shows the information collected for procedure...

...PHY 114
Faraday’sLaw of Induction
Stephanie Scott
Section: 10849
Group #3
Bochao Li
3/31/15
Abstract:
The objective of the Faraday’sLaw of Induction lab was to verify Faraday’slaw of induction by measuring the emf generated in a small coil and comparing it with the calculated value. Secondly the goal was to investigate the relationship between the emf and the frequency of the driving signal. The magnetic field was found to be uniform throughout. For the frequency of 40 Hz, the average current was found to be 0.634, the experimental magnetic field was found to be 29.21 Gauss while the average magnetic field calculated from the max and minimum values was 31.25 Gauss giving a percent error of 6.53%. V emf was calculated to be 0.03177V and the average voltage was found to be 0.0365V giving a percent error of 14.89%. For the frequency of 120 Hz, the average current was found to be 0.5675. The experimental magnetic field was found to be 26.14 Gauss while the average magnetic field was found to be 22.2 Gauss. Giving a percent error of 17.75%. The V emf calculated was 0.12257V and the average V was found to be .1025 giving a percent error of 16.45%.
Objective:
The objective of the Faraday’sLaw of Induction lab was to verify Faraday’slaw of induction by measuring the emf generated in a small coil...

...Table of Contents
Abstract……………………………………………………………………………………………2
Introduction………………………………………………………………………………………..2
Background………………………………………………………………………………..2
Objectives…………………………………………………………………………………2
Scope………………………………………………………………………………………3
Theory review……………………………………………………………………………………..3
Design of report…………………………………………………………………………………...5
Procedures…………………………………………………………………………………………5
Results……………………………………………………………………………………………..6
Discussion…………………………………………………………………………………………6
Conclusion………………………………………………………………………………………...7
Reference……………………………………………………………………………………….....7
Appendix…………………………………………………………………………………………..7
ABSTRACT
This experiment introduces the use of dimensionless analysis and conventionally analytical method to survey the performance of centrifugal pump. The end of this experiment points out the benefit of using the “new” method to the conventional in most practical problem, especially in the survey of turbo-machine. Also, through this experiment, students know some basic indexes to assess the efficiency of pumps used. We will that for the specific fan conducting this experiment, the best efficiency point occurs at CQ = 0.2, the specific speed NS ~1.23.
INTRODUCTION
Background
A fan is a turbo-machine in which work is done to increase the total pressure of the fluid leaving the device. This is achieved by a rotor or impeller, which is driven by an external source of power to move a row of blades so as to...

...Daphny Maldonado
Bio Lab 2107
Kiah Britton
W 10-12:30
Is H20 Bad for You?
Abstract:
In the village of Gopher Hollow there’s a cluster of Blue Baby Syndrome. There were
four infants affected by this cluster. The families from the infants would collect their
water from wells. We have to determine what’s the source of the high levels of nitrites in
the water. The four sources that could be the point of contamination are a new
subdivision, textile plant, an organic farm, and a mountain lake. We had to ﬁnd the
concentration of each known standard and unknown standard. We did this by using a
spectrophotometer. The results were the following, the organic farm with a herd of 50
cows and a 10 acre ﬁeld of zucchini had the highest levels of nitrites.
Introduction:
Blue Baby Syndrome is a condition that affects many infants. This condition makes
the baby’s skin turn blue because of the lack of oxygen. This condition can exhibit
lethargy, vomiting and not being able to breathe. It can even lead to death in rare cases.
This condition is caused by the excess amount of nitrate that is then converted into
nitrite by the digestive system. The hemoglobin then reacts with the nitrites to form
Methemoglobin. Methemoglobin is not a problem in adults since they have an enzyme
that converts methemoglobin back to hemoglobin. Infants don’t have many of the
enzyme to convert methemoglobin to hemoglobin, resulting in Blue Baby Syndrome. For
example in Gopher...

...
Coulomb’s Law
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's law 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 charge jumped across the gap. The...

...Aim: To determine a value for the spring’s force constant, k.
Introduction:
Hooke’s Law indicates the relationship between the amount of extension, e, of a spring to the size of the force, F, acing on it.
This relationship may be written as :-
F = ke
F = ke
where k is a constant for which particular spring you are using. It is the force constant of the spring.
* The force applying on the spring, F, is denoted by Newton in SI Units. (N)
* The amount of extension of the spring, e, is denoted by meters in SI Units. (m)
* The force constant of the spring, k, is denoted by Newton over meters in SI Units. (N/m or N m-1)
The variables for this experiment are as identified below:
* Independent Variable: Slotted Masses of 100 g each
* Dependent Variable: The Amount of Extension of the Spring, e
* Controlled Variable: The Elasticity of the Spring-in-Use
Diagram:
* We have set up our equipment as shown in the diagram opposite. In doing so, we made sure that the spring and meter stick hang over the edge of the bench, where the experiment is being carried out. There should be no interaction between the mass & the spring and the meter stick or the edge of the bench. This will enable us to have larger extensions of the spring.
* Counter Balance
Counter Balance
A clamp or a counter balance, such as a heavy book in this case, is preferable to use in order to provide for the balancing of the equipment since it...

...LABREPORT ON VERIFICATION OF HESS’S LAW
Our purpose of doing this lab was to prove the Hess’s law correct. Hess’s law suggests that the enthalpy change of a reaction must be equal to the sum of the enthalpy changes of the related reactions which lead to the original reactions. The following are the reactions at the lab;
1) NaOH ( s) NaOH (aq)
2) NaOH (aq) + HCl (aq) NaCl (aq) + H2O (l)
3) NaOH (s) + HCl (aq) NaCl (aq) + H2O (l)
As explained before, Hess’s Law states that the enthalpy change of reaction three (ΔH3) should be equal to the sum of the enthalpy changes of the first two reactions ( ΔH1 + ΔH2 ).
As seen at the equations, the solid NaOH dissociates into its ions, after that it is neutralized by HCl.
DATA COLLECTION AND PROCESSING
Temperature Data Table for Trial 1
Trial 1 | Initial Temperature / °C ± 0.5 °C | Final Temperature / °C ± 0.5 °C |
Reaction 1 | 24 °C | 30 °C |
Reaction 2 | 25 °C | 31 °C |
Reaction 3 | 24 °C | 35 °C |
Specific heat capacity: 4.18 J g-1 °C-1
Density of the solutions: 1 g cm-3
Volume of solutions: 100 cm3 ± 0.1 cm3
Molar mass of NaOH = 40 g mol-1
Temperature Data Table for Trial 2
Trial 2 | Initial Temperature / °C ± 0.5 °C | Final Temperature / °C ± 0.5 °C |
Reaction 1 | 23 °C | 28 °C |
Reaction 2 | 24 °C | 30 °C |
Reaction 3 | 23.5 °C | 36 °C |
Qualitative Data: At the first...

... LabReport
Purpose: 1. To test Mariotte's Law
2. To test Charles' law
3. To test Gay-Lussac's law
4. To test ideal gas law
Theory: Mariotte’s law
Charles’ law
Gay-Lussac's law
Ideal gas law
Apparatus: beaker, boiling water, thermometer, pressure-meter, oil, closed tube.
Procedure:
1) Set up all the apparatus
2) Open the rubber cap. Move the closed tube several times to ensure that the oil is spread equally.
3) Pour boiling water into the beaker and put thermometer into beaker.
1. Mariotte’s law
1) Move closed tube to let gas volume be 2 unit volume (V0=2).
2) Cover the rubber cap.
3) Move the tube to make volume change, and measure the pressure.
2. Charles’ law
a. Let Volume be V0=2.
b. Put tube into the boiling water
c. Change the temperature of gas
Measure the pressure
3. Gay-Lussac’s law
1 Change the volume and temperature and make sure that pressure won’t change
4. Ideal Gas Law
a. Let volume be 2 unit volume.
Data:
V(unit volume)
2
1
3
4
P(*105Pa)
1
2
0.7
0.47
P*V
2
2
2.1
1.88
V(unit volume)
2
2
2
T=273+t
301
331
351
P(*105Pa)
1
1.2
1.35
P/T
0.0033
0.0036
0.0038
P(*10^5Pa)
1
1
1
T=273+t
305
335
354
V(unit volume)
2
2.31
2.35
V/T
0.0066
0.0068
0.0066
T=273+t
304
333...

...
Coulomb's Law
1. Objective - To study the validity of Coulomb’s law 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’s law 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 will look at how the magnitude and sign of...