The Magnetic Field Of A Permanent Magnet

What is magnetism? When two pieces of iron are attracted to each other by physical means or electrical means.

The current has a positive charge in one side of the coil and it transforms to negative when it gets to the other side of the coil. This charge controls the magnetic field, making the like charges repeal and the opposite charges attract.

- The magnetic field does not change the speed of the electrons. Since the magnetic field is always perpendicular to the velocity, only the electron movement direction changes and not the speed.

Conductor – conductor is an object or type of material that allows the flow of electrical current in one or more directions. The electrons move easily to the other side, away from the object

An electric current exists when there is a net flow of charge through a given area. Electrons flow from the negatively charged region to the positively charged region. This is usually accomplished by using an electrical conductor which allows the electrons to pass freely through the material (Serway, et al. 709). This flow of electrons can generate heat when collisions between the molecules and electrons occur. These collisions then cause the molecules to break apart thus releasing heat. Some common examples of electrical energy are lightning, static electricity, and wiring outlets (Coleman, et al. 82). For the wildland firefighter, lightning is probably the

Lenz’s Law: “An induced EMF always gives rise to a current that creates a magnetic field that opposes the original change in flux ”1

In order to study the tendencies of the primary and secondary coils as they transfer energy through inductive coupling, a system that can aptly demonstrate the process is needed.

By using a twister pair of wires the electromagnetic signals generated by the wires cancel each other out due to their opposite polarity.

The Railroad and the Pony Express has been the only way to communicate remotely and send correspondence. Joseph Henry and Samuel F.B. Morse would sculpture the future of communication with the invention of the electromagnet and telegraph. Joseph was a graduate of Princeton (Then called the College of New Jersey) as a physicist. The fascination with electricity and magnetism in which he had read reports on from Europe fascinated his desire to research and develop an electromagnet. This shaped our future of electricity as we see it today. With the ability to distinguish between high amperage circuits and high voltage circuits, this laid the baseline for what we know today as “Inductance”. Electrical conductor produces energy by the changing of current or the changing of voltage to produce a strong magnetic force while only using a small battery. By Joseph Henry’s introduction to inductance also paved a path for the invention of electric motors. These advances in technology developed a method for illuminating homes and streets. The use of electricity was spreading almost as fast as the railroad. This improved the lifestyle and functionality of America. (Tindall, Shi

A train is travelling with a constant velocity of 80 kmh-1 in a area where the vertical component of the Earth’s magnetic field is 3.6 × 10-5 T. a. b. What is the size of the EMF induced across each 1.0 m long axle? [ 8.0 × 10-4 V] If the train is travelling in a south westerly direction, describe the force acting on the electrons on each axle.

Just as a current carrying conductor in a magnetic field will experience a force and resultantly move, so too do charged particles in a magnetic field. When a moving charged particle travels through a magnetic field it experiences a force related to its velocity, charge, direction and the strength of the magnetic field.

The transformer can work either way to decrease or increase the voltage. Transformer that increase voltage is called step up transformer, and one that decrease voltage is set down. Transformers only work if alternating current is given to the primary coil. If direct current was supplied, there would be no current in the secondary coil. The transformer has two coil system primary and secondary system. The magnetic force of the first set of wires causes the second set to change the power. The one set is an incoming voltage which is usually thicker and the other one is thinner and will be lower in

Originally electricity and magnetism were thought of as two separate forces. This view changed, however, with the publication of James Clerk Maxwell's 1873Treatise on Electricity and Magnetism in which the interactions of positive and negative charges were shown to be regulated by one force. There are four main effects resulting from these interactions, all of which have been clearly demonstrated by experiments:

If a current is flowing, self-inductance tends to keep it from building up. Henry found that self-inductance is greatly affected by the configuration of the circuit, especially the coiling of the wire. He also discovered how to make non-inductive windings by folding the wire back on itself.

❖ Generators action can take place when and only when, there is a relative motion between conducting wires and magnetic lines of force.