A copper wire has a cross sectional area A1 = 10-6m² and has a density of charge carriers of 1029 electrons/m³ . As shown in the figure, the copper wire is attached to an equal length of aluminum wire with a cross sectional area A2 = 4 x 10-8 m2, and density of charge carriers of 5 × 1028 electrons/m³. A current of 8 A flows through the copper wire. %3D Approximate resistivities of copper and aluminum are pCu = 2 x 10¬8 2.m and pAI = 3 × 10-8 2.m respectively.

Consider a wire of a circular cross-section with a radius of R = 3.00mm. The magnitude of the currentdensity is modeled as J=cr2=5.00106Am4r2 . Whatis the current through the inner section of the wire from the center to r = 0.5R?

Taking R = 1.00 k and = 250 V in Figure P21.49, determine the direction and magnitude of the current in the horizontal wire between a and e. Figure P21.49

What current flows through a 2.54-cm-diameter rod of Pure silicon that is 20.0 cm long, when 1.00103 V is applied to it? (Such a rod may be used to make nuclear- particle detectors, for example.)

A cylindrical silicon rod is 1.0 cm long and has a cross-sectional radius of 2.0 mm. What is the magnitude of the current passing through the rod when a voltage of 120 V acts on it? The resistivity of silicon is 2200 Ωm.

A strip of doped silicon 260.0 um wide contains 8.80 x 10-2 conduction electrons per cubic meter and an insignificant number of holes. When the strip carries a current of 102 µA, the drift speed of the electrons is 59.6 cm/s. What is the thickness of the strip? Um

copper conductor of length 15.24 m and diameter 2.05 mm carries a current of 15 A. Find the electric field intensity, drift velocity, voltage drop and resistance of the conductor. The conductivity and electron mobility in copper is given by 5.8 x 10^7 S/m and 0.0032 m^2/V.ssrespectively.

A copper wire of radius a = 0.273 mm has an aluminum jacket of outer radius b = 0.399 mm. There is a current i = 2.82 A in the composite wire. Take the resistivity for copper and aluminum to be 1.69 × 10-80-m and 2.75 × 10-8Q-m. Calculate the current in (a) the copper and (b) the aluminum. (c) If a potential difference V = 17.0 V between the ends maintains the current, what is the length in meters of the composite wire?

An 18 gauge copper wire (diameter 1.02 mm) carries a current with a current density of 3.20 * 106 A/m2. The density of free electrons for copper is 8.5 * 1028 electrons per cubic meter. Calculate (a) the current in the wire and (b) the magnitude of the drift velocity of electrons in the wire.

Chapter 26, Problem 051 GO Wire C and wire D are made from different materials and have length Lc = LD = 1.4 m. The resistivity and diameter of wire C are 5.4 x 10-6 2-m and 1.28 mm, and those of wire D are 3.9 x 10-6 Q:m and 0.53 mm. The wires are joined as shown in the figure and a current of 4.6 A is set up in them. What is the electric potential difference between (a) points 1 and 2 and (b) points 2 and 3? What is the rate at which energy is dissipated between (c) points 1 and 2 and (d) points 2 and 3? -Lp (a) Number Units (b) Number Units (c) Number Units (d) Number Units