Linear density is represented mathematically as: The value is especially useful for measuring the weight of objects that appear to be one-dimensional, such as threads, strings, yarn and wires. Linear density is the degree of mass per unit length. Like the coefficient of friction, μ r is also dimensionless. In free space or a vacuum, this value is equal to 1. The relative permeability of μ r is the ratio μ/μ0. ![]() But with the redefinition of the ampere in 2019, μ 0 is no longer equal to this value so it must be determined by experimentation. In SI units, μ 0 was earlier equal to 4π × 10 -7 weber per ampere-meter. It is also known as the permeability of vacuum and the magnetic constant. The designation μ 0 (pronounced as mu naught or mu zero) refers to the permeability of free space. The field is produced by the flow of electric current through a wire. H is the magnetic field strength of the magnetizing field. It depends on the concentration of magnetic field lines ( flux) per unit cross-sectional area. Magnetic permeability refers to the relative change (increase or decrease) in the magnetic field inside a material compared to the magnetizing field where the material is located.ī in this case is magnetic flux density established within the material. The letter µ in physics: Magnetic permeability In contrast, in kinetic friction, the frictional force resists the motion of an object. Also, the frictional force resists force applied to the object. In static friction, the object remains at rest until the force of static friction is removed. The value of μ is different for static friction and kinetic friction. The coefficient of friction is dimensionless because both F and N are measured in units of force (e.g., newtons or pounds). Mathematically, the coefficient of friction is represented as: The frictional force and the motion of the object are in opposite directions. The coefficient of friction refers to the ratio of the frictional force (F) resisting the motion of two surfaces that are in contact to the normal force (N) that's pressing the two surfaces together. In physics, the letter μ is commonly used to represent the coefficient of friction and magnetic permeability. The letter µ in physics: Coefficient of friction It is used to represent many real-world quantities, including magnetic permeability, coefficient of friction, electrical mobility of charged particles and mass per unit length. In some texts, the symbol µ is an abbreviation for micrometers or microns. ![]() Like many other Greek letters, μ is used to represent several real-world quantities and phenomena across multiple academic and practical streams including the following: Mu originated from the Phoenician letter mem, which itself evolved from the Egyptian hieroglyphic for water. The uppercase representation M is the same as the Latin/English letter M. The symbol μ is the lowercase representation of the 12th letter of the Greek alphabet. For example, 0.000001 farad or 10 -6 F of electrical capacitance is commonly written as 1 ♟. Restore names into edit fields and default settings.The lowercase Greek letter µ (pronounced mu) generally represents the prefix multiplier 0.000001, i.e., 10 -6 or one millionth. When the pin is down the dialog will remain open, otherwise when the pin is up the dialog will close. Action buttons RunĬlose the dialog without further changes.Ĭontrols whether to keep the dialog open when you click Run. Lets you specify the colour of the shaded area between the smoothed density lines when the Fill envelope option is selected in the Options. Lets you specify the colour of the lines used to draw the smoothed density lines. Select the colour you want to use to fill the area. If selected, this enables a list of colours from which you can fill the inner area of symbols. Lets you specify the colour of the symbols used on the graph. The value 1 represents the standard size used. Lets you specify an amount by which the standard size of the symbols are to be multiplied by. Lets you specify a symbol that you can use to represent the points in the graph. This opens the Graphics Line and Symbol attributes dialog which allows the line and symbol attributes to be edited in a list, enabling easier access to multiple plots at once. The groups are represented by the ordinal values and you can then set line/symbol attributes for each different level of the group. ![]() If groups have been specified on the data menu then these will be shown in the list for each graph. Lists the current plot for you to specify the line or symbol attributes. Use this to set the symbols and area colour for a 1D Density Plot.
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