A typical datum is about 100 and the field is directed vertically in such a way as to drive positive charges downward.2. A quantitative term indicating the electric field strength of the atmosphere at any specified point in space and time.
3. A measure, in volts per meter, of the electrical energy in a given portion of the earth's atmosphere at a given time.
2. The electrostatic field around a charged particle or object.
2. A region in space in which a stationary electric charge experiences a force due to its charge.
3. The area around an electrically charged body in which other charged bodies are acted on by an attracting or repelling force.
4. The lines of force exerted on charged ions in the bodily tissues by the electrodes that cause charged particles to move from one pole to another pole.
5. One of the fundamental fields in nature, causing a charged body to be attracted to or repelled by other charged bodies.
Associated with an electromagnetic wave or a changing magnetic field.
The electric field is stronger where the field lines are close together than where they are farther apart.
The value of the electric field has dimensions of force per unit charge and is measured in units of newtons per coulomb.
2. The effect of an electric field on spectrum lines.
The electric field may be externally applied; but in many cases it is an internal field caused by the presence of neighboring ions or atoms in a gas, liquid, or solid.
The electric field is the set of all values of the electric field strength, but electric field and electric field intensity (as well as electric field strength and electric vector) are used more or less interchangeably.
The trend is to use an electric field both for the field taken as a whole and for its value at any point with a context being sufficient to determine the precise meaning.
2. The electric and magnetic fields generated by a static or oscillating electric multipole.
2. The force on a stationary positive electrical charge per unit charge at a point in an electric field.
It is usually measured in volts per meter.
2. A laboratory simulation of steady-state fluid flow through porous reservoir media.
It depends on the mobility of ions in absorbent media (gelatin or blotter), or through a liquid (potentiometric technique which is a device used to make a precise determination of the electromotive force, or maximum output voltage, of a cell or generator by comparing it with a known voltage).
Included are the fields produced by light, radio, X-rays, and gamma rays and the higher the frequency of the fields produced, the more energy is contained.2. The combination of electric and magnetic fields that surround moving electrical charges (for example, electrons); such as, those in electric currents.
Electromagnetic fields apply a force on other charges and can induce current flows in nearby conductors.3. An oscillating electric field and its associated magnetic field acting at right angles to each other and at right angles to their direction of motion.
4. The region surrounding a moving electric charge which consists of magnetic and electric force fields especially related; such as, to orientation and strength, and that possesses a definite amount of energy.
5. A field created by the interplay of an electric field and a magnetic field when an electric current passes through a wire.
An electromagnetic field consists of two kinds of energy: electrostatic (potential energy) and electrodynamic (kinetic energy).
2. An electric field with constant intensity; such as, that which is produced by stationary or static charges.
3. The region around an electrically charged subject which will induce an electrical charge on a second object, causing it to experience a force.
The voltage gradient or measure of the change of the physical quantity between two points at different potentials.
If an RFID tag is outside of one full wavelength of the reader, it is said to be in the "far field." If it is within one full wavelength away, it is said to be in the "near field."
The far field signal decays as the square of the distance from the antenna, while the near field signal decays as the cube of distance from the antenna.
So passive RFID systems that rely on far field communications (typically UHF and microwave systems) have a longer read range than those that use near field communications (typically low- and high-frequency systems).
They include the plotting of the orientation of such structural features as faults, joints, cleavage, small folds, and the attitude of beds with respect to three-dimensional space.
A common objective is to interpret the structure at some depth below the surface of the earth.
It is possible to determine, with some degree of accuracy, the structure beneath the surface by using information available at the surface of the earth.
2. The programming of information into a tag after it has been shipped from the manufacturer, usually meaning that information specific to the application can be added by the using organization. The tag is "read only".
The intensity of the magnetic field at the earth's surface is approximately 0.32 gauss at the equator and 0.62 gauss at the north pole.
A gauss equivalent to 1 maxwell per square centimeter and a maxwell is equivalent to the flux that produces one abvolt in a one-turn circuit when the flux is reduced to zero at a uniform rate in one second; while a flux is the electric or magnetic field lines of force that traverse a given cross-sectional area.
The earth's internal magnetic field reverses, on average, about every 300,000 to 1 million years.
This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years.
The time between reversals is highly variable, sometimes less than 40,000 years and at other times as long as 35 million years and no regularities or period times have been discovered so far.
A long interval of one polarity may be followed by a short interval of an opposite polarity.
The field then forces the ions to a fluorescent screen, which shows an enlarged image of the tip, and individual atoms are made visible.
If an RFID tag is within full wavelength of the reader, it is said to be in the "near field."
If it is more than the distance of one full wavelength away, it is said to be in the "far field."
The near field signal decays as the cube of distance from the antenna, while the far field signal decays as the square of the distance from the antenna.
So passive RFID systems that rely on near-field communication (typically low- and high-frequency systems) have a shorter read range than those that use far field communication (UHF and microwave systems).
Tags outside the reader field do not receive radio waves and can't be read.
2. Specifically, the effort by Einstein and others to unify gravitational force and electromagnetic force with a single set of laws and, more generally, to provide a geometrical interpretation for all physical interactions.