In a cylindrical conductor of radius 2mm, the current density varies with the distance from the axis according to J = 1000 e-400 r Am², the total current (I) is----
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- The quantity of charge q (in coulombs) that has passed through a surface of area 2.05 cm2 varies with time according to the equation q = 4t3 + 3t + 6, where t is in seconds. (a) What is the instantaneous current through the surface at t = 1.10 s? A (b) What is the value of the current density? KA/m2A copper wire has a circular cross section with a radius of 1.66 mm. HINT (a) If the wire carries a current of 3.18 A, find the drift speed (in m/s) of electrons in the wire. (Take the density of mobile charge carriers in copper to be n = 1.10 x 102⁹ electrons/m³.) m/s (b) For the same wire size and current, find the drift speed (in m/s) of electrons if the wire is made of aluminum with n = 2.11 x 1029 electrons/m³. m/sthis problems is giving me hard time
- AsapThe earth’s surface has a negative surface charge density of 10-9 C m-2. The potential difference of 400 kV between the top of the atmosphere and the surface results (due to the low conductivity of the lower atmosphere) in a current of only 1800 A over the entire globe. If there were no mechanism of sustaining atmospheric electric field, how much time (roughly) would be required to neutralise the earth’s surface? (This never happens in practice because there is a mechanism to replenish electric charges, namely the continual thunderstorms and lightning in different parts of the globe). (Radius of earth = 6.37 × 106 m.)What is the current in a wire of radius R = 2.83 mm if the magnitude of the current density is given by (a) J, - Jor/R and (b) J, = Jo(1-r/R) in which r is the radial distance and Jo = 7.58 x 104 A/m2? (c) Which function maximizes the current density near the wire's surface? (a) Number i Units (b) Number i Units (c)
- 6- chapter27-question17 A small current of 1.5x 10 10 A exists in a copper wire whose radius is 1.0 mm. The number of charge carriers per unit volume is 9.0 x 10 m³. Assuming the current is uniform, calculate the electron drift speed in m/s. (n = 3.14, qe = 1.6 × 10~1ºC) Option1 Option2 Option3 Option4 Option5 1.6 x 10-14 | 3.3 × 10-14 4.7 x 10 14| 5.1 x 10-14 | 0.8 x 10-14 a) Option5 b) Option1 c)O Option4 d) O Option3 e) Option2 O Boş bırakWhat is the current in a wire of radius R = 2.01 mm if the magnitude of the current density is given by (a) Ja = Jor/R and (b) Jb = Jo(1 - r/R) in which ris the radial distance and Jo = 6.22 x 104 A/m2? (c) Which function maximizes the current density near the wire's surface? (a) Number Units (b) Number Units (c)1.) The electric field of the material between two coaxial cables of radius 0.525 cm and 0.675 cm is given as 2.58 V-m E If the conductivity of the material is 5 x 1010 S/m, what is the current density in the material?