Question

can someone help me with these problems, if you could detail your answer I would be grateful :D

Problem 1

a) A 1.5 m long conductor is 6.5x10 ^ 25 electrons / m3. In this medium the electrons move at 4x10 ^ (- 4) m / s How many electrons per second pass through the 1.5 mm ^ 2 section?

b) If at a temperature of 20C the conductor resistivity is 3.7x10 ^ (- 3) ohm * m the electric field (in SI) is?

Problem 2

a) a rod of length l = 10cm is located on the axis "x" has a load per unit length of + 2.5nC / m and with a = 5cm. A load q = -6uC passes over the origin of coordinates, moves with a velocity v in the direction shown on the "y" axis
What should be the kinematic energy (in uJ) of the load q, to ​​move infinitely away from the rod?

b) If the potential is zero at infinity, what is the electric potential (in V) produced only by the rod at the origin of coordinates?

Answer 1

- 1) a election density =d=6.5*102 duett om? . duft velocity = 4x10-4 m/s to 10 The electrons which cross section I at t=0 will reach section ® alt=1 a) All the electrons that have crossed section I in Isea - are in the cubiced volume cuboidal 1. No. of electrons inai inside the cuboid = election density x volume d x A xd A 1.5x0 mm : 1.5*10-3 m2 a = distance travelled by election in Iseconda uxl = 4x104m 16 No. of charge carries crossing the given area per 65x1025 x 1.5x10-6 x 4x10-4 - 3.9 110 eletromy e Ans J= current JDE Ex electric density field se conductivity = 1 pa resistivity - J = I In charge flowing perseci - <16110-19 x 3.9x1016 3 6.24 mA I. بها HIC 1x 14 x 3.7x10 - 15.392 Net : 15.392 15 tour