The diameter of a 12-gauge copper wire is 0.81 mm. The maximum safe current it c
ID: 1399783 • Letter: T
Question
The diameter of a 12-gauge copper wire is 0.81 mm. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20.0 A. At this current, what is the drift velocity of the electrons? The number of electron carriers in 1.0 cm3 of copper is 8.5 x 1022 6. 7. An electron moves along the x-axis. When the electron passes through the origin, the magnitude of the magnetic field at a position of (0, 5.00 cm, 5.00cm) is 8.52 x 10-18 T. What is the speed of the electron A long straight wire on the z-axis carries a current of 6.0 A in the positive direction. A circular loop in the xy-plane, of radius 10 cm, carries a 1.0-A current, as shown in the figure. Point P, at the center of the loop, is 25 cm from the z-axis. An electron is projected from P with a velocity of 1.25x 10 m/s in the negative A x-direction. What is the force (magnitude and direction) on the electron? 8. 10A 25 cm 10cm A conducting bar slides without friction on two parallel horizontal rails that are 25.0 cm apart and connected by a wire at one end. The resistance of the bar and the rails is constant and equal to 0.100 . A uniform magnetic field is perpendicular to the plane of the rails. A 0.0450-N force parallel to the rails is required to keep the bar moving at a constant speed of 0.750 m/s. What is the magnitude of the magnetic field? 9.Explanation / Answer
Sry , according to our policy we can solve one ques at a time .
So I am solving the first question.
(6)Drift velocity (u) = I/nAq where I is the current , n is the no. of free electrons per cubic cm and q is the charge
Area (A) = Pi(d2)/4 = .515*10-2 Cm2
u = I/nAq = 20/(8.5*1022)(.515*10-2)(1.6*10-19) = .285 cm/s