Electricity and Magnetism

Magnetic field strength is proportional to the speed at which the charge moves and the size of the charge. Protons are made up of 3 basic properties, positive electric charge, a very small mass and spin. A protons charge is extremely small although the speed at which is spins is extremely quick. This creates a magnetic field that can be detected. About 70% of the human body is comprised of water and water is the largest source of protons of any substance within the human body. This is followed by fat. The direction of the protons magnetic field is randomized when no magnetic field is applied. Similar to a compass, the magnetic field that the proton creates can be aligned when another large magnetic field is introduced. In MRI this field is known as B0. (Simplyphysics.com,

There are three requirements for the magnetic fields: “A large reservoir of fluid that can conduct electricity

Field line patterns exist within a magnetic field that is created by a current. These field lines of a coil or a solenoid can be traced by using a compass because they create a dipole pattern, meaning that they diverge from the north end and

The belief that magnets carry a “magical” component useful in different healing practices has been observable throughout history. From the days of the ancient greeks, to the height of the french court, and eventually making its way to modern America, magnetic healing therapies have struck a chord with many people.

and stereos. Electrical transmission lines transport electrical energy over long distances. For instance, think how your life would be without electricity. In my opinion that would be like not being able to read the Word of God. We need the Word to help guide us and to be our light, so therefore we need electricity or some type of light to be able to see in the dark. Jesus brought us out of darkness and into the light. The electric force is even more basic than “electricity.” It keeps atoms and molecules together, even the ones that make up our bodies. Magnetism is also associated with electricity; they are basically inseparable. Therefore, without magnetism,

One aspect that is understood, however, are the effect magnetic fields have on our bodies during everyday life. We are constantly being exposed to magnetic fields. Microwaves, power lines, radio waves, refrigerators: these all give off magnetic charges (CSA, 1994; Barnothy p. 123). The earth is surrounded by a magnetic field, which is the reason for the North and South poles (Leonard, 861).

Electromagnetic fields, or EMFs, is sometimes referred to as radiation. We are exposed to EMFs almost all the time. Almost all of the electronics or powered devices have some sort of electromagnetism in them. This includes your cell phone, kitchen appliances, television, lights, and computer. Electric door bells also use electromagnetic fields. When the button is pushed it signals for the coil to get electrified, then the bell sounds all because of the electromagnetic force.

A magnetic field is an area in which there is an electrical charge where a magnetic force acts. A magnetic field can be induced in a circular loop and it can be calculated if the radius, current, and number of turns are all known. When in the form of a coil it is directed along the axis of the coil and is usually uniform throughout the coil until it begins to fall off when it gets further away from the center. Another characteristic of magnetic field is that it can be changed to induce a voltage. That induced voltage is known as the magnetic flux and it can be calculated by knowing the area of the coil and the value of the magnetic field going through the coil.

First, we will examine how magnetic fields are created, then we will calculate their magnitude and direction.

The lesson objectives were clear and measurable. While reading What Makes a Magnet?, vocabulary and comprehension questions were asked to ensure there was a conceptual understanding of the terms “magnetic” and “nonmagnetic.” These definitions were imperative for a student to know, as they would not be able to sort objects correctly without understanding the concept. Once the students could differentiate between the two groups, students would use a magnet wand to test the objects. This shows that the students could use tools to investigate. Lastly, the students were to sort the objects tested into two groups, placing the objects in either a

The direction of the force is also directed along the same line which joins the to charges together. As stated before it can either be an attractive or repuslive force dependant on the charges.

A magnetic field is the magnetic effect of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. A magnetic field may be plotted by using a plotting compass to define the lines of force.

The Earth’s magnetic field can in fact be closely approximated by a magnetic dipole at its centre, tilted by 11˚ to the Earth’s rotational axis, Figure 1.2. The south pole of this magnetic dipole actually points northwards such that the north pole on a compass will point towards northwards, and more precisely, to the Earth’s magnetic north pole. The magnetic field strength decreases from the poles towards the equator. Currently the field is 56 µT at the magnetic north

The magnetic field of a permanent magnet causes the atoms to move around uniformly in the same direction. This may vary depending on the electrons of the atoms causing a variety of atoms to be able to do this and few which can hold a permanent magnetic field. It is an invisible field and it is also called a vector because of the forces specified direction and magnitude. The arrow displays the direction of the force and also how the forces are. The closer the lines are together it shows how much stronger it is also the further away they are it shows how much weaker they are.

Magnetic repulsion works on the principle of using electro magnets to levitate objects. Unlike normal magnets, electro magnets are created by the movement of current through wires. This means that the strength of the magnet can be changed by increasing or decreasing the current in the wire. As well as this, it is possible to change the poles of the magnet. This is important as it allows the magnet to both push and pull depending on the current. Using the idea that north repels north and south repels south, if the ground were to have the same pole as the electric magnet, then the electric magnet would hover. This idea can better be seen in figure 1.