Question

4. If a metallic wire of cross-sectional area 3.0x 10 m carries a current of 6 A and has a mobile charge density of 4.24 x ca * 10M carriers/m2 what is the average drift velocity of the mobile charge carriers? (charge value 1.6x 10 " coul) a. 3.4 x10 m/s b. 1.7 x 10' m/s c. 1.5x 10 m/s d. 2.9 x 10 m/s S. If a certain capacitor is charged to 10 V and then, at t -0, allowed to discharge through a certain resistor There will be a certain time before the voltage across the capacitor reaches 5 V. This time can be decreased for this circuit by increasing the size of the capacitor. the size of the resistor. the size of the time constant. a. b. c. d. none of the choices. A circular coil (radius 0.40 m) has 160 turns and is in a uniform magnetic field. f the orientation of the coil s varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N-m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field? a. 0.37 T b. 1.6T c. 0.50 T d. 1.2 T 7. There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic force acting on the loop is a. 2ILB b. ILB C. IBL2 d. zero

Answer 1

よ 以→ 乃C C D 0 n c