![]() With the increase in current density (J), electric fields increase, since they are directly proportional.With the increase in current density (J), conductivity (σ) increases since they are directly proportional.SI unit of current density - Ampere per meter square (A/m 2).Current is scalar quantity since it has magnitude but no direction, whereas current density is a vector quantity since it has both.Hence, current density (J) is directly proportional to the electric field (E). Density calculation has been changed: equation 25 in Chengs paper to compute the density of the mixture should use the glycerine fraction by VOLUME and not. Relation Between Electric field and Current Density The units of density depend on the units used for mass and volume, but are usually g/cm³ (if mass is measured in g and volume in cm³). Thus, the current density can be given as Value of V in both above equations equated. If the electric field across the conductor be E, then the potential difference V can be given as If, the distance between two plates is l and the area of the plates is A. Now, the resistance of the conductor depends on the distance between the two ends of the conductor and the cross-sectional area of the conductor. The voltage drop across two ends of the conductor is directly proportional to the flow of current, where R is resistance, which is proportionality constant and opposes the current flow. I-electric current through the conductor in Amperes (A)Ĭurrent Density: Electric Field and Conductivity The density formula is mass divided by volume. When dA is perpendicular to J then, θ =90 o, so, cosθ =1 Density is a physical property of matter that applies to all states of matter (solid, liquid and gas). Read More: Current Electricity Important Questions Current density or electric density is represented in ampere per square meter or A/m 2 or Am -2. ![]() The angle between the cross-section where the current density is measured and the flow of current is 90 o. It is the electric current that passes through has units of charge per unit time(t) per unit area(A). Example: How large is the flux density at a distance of 5 mm for a circular disc magnet made of DeltaMagnet (SmCo) 6 x 4 mm (IBS standard type DE64). Answer Thickness The width of an object is also sometimes defined as thickness (T). Determine the density of the green block. Current Density is represented alphabetically by J.Ĭurrent density is a vector quantity because it has both the magnitude and direction of the flow. density mass volume 5.00kg 10.00L 0.500kg / L Exercise 1.4.1 Remove all of the blocks from the water and add the green block to the tank of water, placing it approximately in the middle of the tank. In electromagnetism, the current density and its measurement play an important role. Difference Between Primary Cell and Secondary Cellĭifference Between Air Conditioning and RefrigerationĬurrent density is the amount of electric current (electric charge) flow in amperes per unit area(A) of cross-section (m 2).
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