A copper wire carries a current from west to east. Assume the magnetic field of the earth at this location to be horizontal and directed from south to north with a magnitude of 5.0E-5 T. How much current would make the magnetic force on the wire equal in magnitude to the gravitational force on the wire for a length of 40 m of wire? The density of copper is 8.92 x103 kg/m3 and the cross-sectional area of the wire is 6.0E-6 m?. Give your answer in amperes, correct to three decimal places.
Ampere Circuital Law
Ampere's Law states that "for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.”
Current Density
To design the electrical and electronic system, the current density is an important factor. The designer current level is the factor on which the circuit performance depends and with the help of the dimensions of the conducting current the current density is then determined. For instance, despite the lower current demanded by smaller devices as integrated circuits are reduced in size, there is a type of trend in achieving the higher device number in even smaller chip areas. The current density is increased in this region at higher frequencies because the conducting region in a wire becomes confined and this is known as the skin effect. The consequences increase as the current densities become higher.
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