Experiment Faraday's Law: Faraday's Law and Lenz's Law

Rafael Couto Sanchez

This is based on one of the laboratories that I like, and this will be more than telling some kind of report essay that I base this work.

According to the laws of magnetism, the flow of current passes through a solenoid generating electric field. Faraday's law states that the greater the flow or change of magnetic field, the greater the electromagnetic frequency is sensed by the solenoid. In the experiment of Faraday's Law is observed how the voltage versus time is behaved when changing the magnet in a coil so as  the phenomenon can be described in the experiment. It was observed that the voltage increased to make the north pole of the magnet coil and the voltage decreased by putting the north pole of magnet in the coil. That removing the magnet faster rate of change increased the magnetic field and by slowing the rate of change of the magnetic field also decreased. I can say that the magnetic field is always looking to create unrest continued and it generates magnetic fields that are contrary to the disturbance occurred.

As is understood, according to the laws of magnetism, the flow of current pass through a solenoid that generates an electric field, a long wire coil with many loops is called solenoid. Therefore, we refer to the solenoid wire cup to be used in the experiment. The magnetic field lines enter and exit through the opposite poles. These relate to the pole top and bottom of the solenoid. The magnetic field lines leave the North Pole N of the solenoid and the field lines are represented by a dot (∙) and current flows counterclockwise. By contrast, output from the South Pole S and are represented by (X) and in this case the current flows clockwise. This experiment aims to generate a voltage based on the magnetic field, as is usually done the opposite. For there to the voltage generated or induced, there needs to be magnetic field flux. This flow is defined asᶲ_B=(B^→ )∙(A^→ )=BA〖cosθ〗_AB, where B is the magnitude of the magnetic field; A is the area of the coil and θ_AB  is the angle of vector field magnetic with respect to a horizontal line (normal).

The study of this practice is known as Faraday's Law, in honor of who discovered it. Faraday quantitatively investigated factors that influence the induced magnetic field. The law tells us that the greater flow of the magnetic field changes, the more often felt by electromagnetic solenoid. Therefore it is concluded that the induced voltage is directly proportional to the rate of change of magnetic flux. Also, note that if the magnetic field travels for clockwise (out by the S pole), the measured voltage value is positive, the opposite (N pole) will be negative.

Next, we have the law of Lenz law says that when a magnetic field flow, the coil generates a current that opposes the flow due to the induced voltage polarity. Lenz's Law defines asV=-〖dϕ〗_B/dt, where is the derivative of the electric flux and dt is the time derivative.

It can give an analysis of what might have happened in this experiment, which could have produced graphs obtained by removing the magnetic field sensor from the solenoid. Where the function can be given in time where the voltage was induced by the movement of the magnet. It "investigate magnetic fields" will achieve how is the behavior of the magnetic field generated by a magnet coil and viewing ratio Faraday's Law, but that would be observed change in the voltage seen on the graph which would be explained by the Lenz's Law, which tells us that the coil is a change in magnetic flux produced by removing or putting the magnet in the coil.

According to my lab mates they observed that when he pulled the magnet coil, the curve of a graph of voltage vs. time came up with the area under the positive and negative magnetic change. This means that the coil increases the voltage in order to keep the flow constant magnetic coil. This is given to increasing the voltage which generates a current which is negative electric field which cancels the magnetic flux change produced by removing the positive magnet. When the magnet is placed on the coil below the curve is out towards positive magnetic flux. This is given by reducing the voltage that generates a current in the coil whose negative magnetic field produced by the magnet.

It was understood that the change of magnetic flux is the negative of the area under the curve described by my colleagues, but the increase in which the magnet is removed resulting in increase in the rate of change of the magnetic flux. It was also understood decreasing the speed at which the magnet is removed, resulting in decrease in the rate of change of magnetic flux. Of course to put the North Pole magnet in a coil generates a magnetic field in the coil south. And finally to make the north pole of a magnet coil generates a magnetic field in the coil north.

References

Giancoli, Douglas C. Physics: Principles and Application 6th edition, Person Prentice Hall, New Jersey, 2005.

J.R. Lopez, P J. Marrero and E. A. Roura, Manual Fisica Experiments II: Electricity, Magnetism, Optics and Modern Physics, John Willy & Sons, United States, 2008.