If a current of 9.6-A flows through a long wire of radius 0.0003 m, what is the flux density produced 0.045 m from the surface of the wire. H AT/m
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- A long copper wire carries a current of 15A which is evenly distributed in each cross-section of the wire. If the diameter of the wire is 3 mm, and the resistance per unit length is 4 ohm/km. Calculate the density of the magnetic and electric fields on the surface of the wire.The inner conductor of a long coaxial cable has radius a. The inner radius of the outer conductor is b. Inner conductor V0, outer conductor at 0 potential. Determine the electric potential and electric field strength in the insulating material.A long, solid, cylindrical wire of radius A has a current density given by j = j0r/A. Determine the magnetic field, within the wire, in terms of the total current "I" flowing through the wire.
- A cylindrical conducting wire which is 4658.98cm long, 83.02mm thick and resistivity of 8.92 ohm per meter has how much resistanceA horizontal wire with a mass per unit length of 0.5 Kg/m carries a currentof 3Amperes in the +x direction. If the wire is placed in a uniform magneticflux densityB, find the minimum magnitude ofBin order to magnetically lift thewire vertically upward.1.Consider a situation where a balloon is rubbed on hair, the balloon is negatively charged. What charge does the hair have? A.Positive B.Neutral C.Negative D.No charge 2.Gauss’s law states that A.the outward flux density of D through a closed Gaussian surface, S is equal to the enclosed charge Qenc in that surface. B.the inward flux density of D through a closed Gaussian surface S is equal to the enclosed charge Qenc in that surface. C.the outward flux density of D through an open Gaussian surface, S is equal to the enclosed charge Qenc in that surface. D.the outward flux density of D through a closed Gaussian surface S is not equal to the enclosed charge Qenc in that surface.
- السؤال Electric flux that streams away symmetrically from a point charge and is coincident with the streamlines and to visualize this flux wherever an electric field is present. الاجابات True FalseShow that the divergence of an electric field and the electric flux density in a free charge zone is zero.Determine the magnetic field strength and the mmf required to produce a flux density of 0.25T in an air gap of length 12mm.
- A certain conductor has a free electron density of 2 x 10 30 electrons per cubic feet. Its circular cross- sectional area is 150,000 square mils and 120 meters long. Its resistivity at 30 degrees Celsius is 0.9 x 10 – 8 ohm-meter. If a current of 3 A passes thru this conductor, find the drift velocity in mm per second.1. A 400 mm length of conductor carrying a current of 25 A is situated at right-angles to a magnetic field between two poles of an electric motor. The poles have a circular cross-section. If the force exerted on the conductor is 80 N and the total flux between the pole faces is 1.27 mWb, determine the diameter of a pole face.A long straight wire placed along az -axis carries a current of I = 6 A in the +az direction. The magnetic flux density at a distance r = 5cm from the wire will be