Unformatted text preview: of the ribbon and a transverse voltage equal to 50 μ V is measured across the width. What is the average velocity of electrons in metal? What is the number of conducting electrons per unit volume of this metal? 24 points. 4. Two wires, each having a weight per unit length of 10 –4 N/m, are strung parallel, one 0.2 m above the other. If the wires carry the current of same magnitude, how great must the current in each wire be for the magnetic field due to the lower conductor to balance the weight of the upper conductor? What have to be the directions of the two currents for that to work? 24 points. 5. A flat uniformly charged disk with radius 10 cm and total charge of 10 μ C spins at a rate of 100 turns per second around its axis. What is the magnetic field magnitude next to the center of the disk? Hint: this problem most likely requires integration. 24 points....
View Full Document
- Fall '10
- Electron, Magnetic Field, Electric charge, magnetic field magnitude