What Is EM?


In physics, the term EM (electromagnetic field) describes a classical field produced by accelerating electric charges. This field corresponds to the classical counterpart of the quantum electromagnetic field tensor. There are two types of electromagnetic fields – the AC electromagnetic field and the Non-ionizing radiation field.

Electromotive force

Electromotive force is a measure of electrical action. This force is measurable in volts and is a form of energy derived from converting other forms of energy. This force can be used for electrical purposes, such as motors, switches, and other electrical devices.

This force is proportional to the time derivative of the magnetic field. It is not present when the magnetic field is stationary or static. However, it may occur if an inductor is present. In this case, the electromotive force will be opposing. This is because the flow direction would be opposite to the direction of the real power.

The electromotive force can be measured with the help of a voltmeter and Kirchhoff’s Voltage Law. The force is measured in Volts, and a Volt is one Joule per coulomb. A simple circuit like a lamp connected to a battery can demonstrate this phenomenon.

AC electromagnetic field

The AC electromagnetic field is an electromagnetic field that is produced by power lines and appliances located near them. It can affect health and safety in a variety of ways. Unfortunately, the highest level of AC magnetic fields can occur close to power lines. Fortunately, you can protect your family and yourself by ensuring that your living spaces have AC magnetic field levels below 1.0 mg.

Pulsed AC often generates AC electromagnetic fields. These pulses can have strengths ranging from 30 to 160 kV m-1. While many in vivo electroporation protocols use square wave pulses, a few use monotonically decreasing pulses. One method of creating strong AC electromagnetic fields is a primary/secondary coil system. The primary coil is made from an applicator used for established transcranial magnetic stimulation systems, and the secondary coil is a unique device that is implantable in tissue.

Non-ionizing radiation field

A non-ionizing radiation field is a form of electromagnetic radiation that can harm humans. The ICNIR is an international organization that developed guidelines for the safe use of time-varying electromagnetic fields that harm human health. The International Commission on Non-Ionizing Radiation (NIR) has stated guidelines for these fields. The Institute of Electrical and Electronic Engineers (IEEE) has developed a standard called IEEE C95.6-2002.

Non-ionizing radiation can come from various sources, from household appliances to electrical wiring. It can also come from the radio waves generated by radios, computers, and televisions. In addition, MRI machines and other medical devices emit non-ionizing radiation, as do certain types of tanning beds, electrical wiring, and welding torches.

Magnetic field

A magnetic field is created when an electric current flows through a magnet. It is similar to water flow in a garden hose: as the water flows, the magnetic field increases. The strength of a magnetic field is measured in milliGauss. Magnetic fields are used to understand electromagnetism and other physical processes.

The magnetic field is a force that attracts or repels objects and charges. Objects are drawn to regions with higher magnetic fields. Electric currents, permanent magnets, and electromagnetic waves are all sources of non-uniform magnetic fields. If you observe a magnet that has a non-uniform magnetic field, you will notice that the lines that form at one pole are curved.

Magnetic fields are used in modern technology. For example, electric motors and generators use rotating magnetic fields to produce electricity. The interaction of these fields in an electrical device is called a magnetic circuit. Moreover, the Hall effect relates magnetic forces to the charge carriers in a material. The Earth also produces its magnetic field, which is essential for navigation using a compass.

Power lines

Electric and magnetic fields from power lines can affect your home. They spread over tens of meters and depend on the voltage of the transmission line. The higher the voltage, the wider the zone of the increased magnetic field will be. However, the dimensions of this zone do not change throughout the life of the transmission line.

Many studies have been conducted on the health effects of power lines and EMF. However, the results of such studies have not been conclusive. It isn’t easy to test for every possible health effect. The World Health Organization, for example, admits that there are many unknowns about EMF and its health effects. Nonetheless, decades of research have not shown any significant public health risks. This is why opponents of power lines can still hold onto their positions.