Question

6. A current of 3.5 pA flows through a copper wire. The diameter of the wire is 30 mm. The number of charge carriers per unit volume is 1.7x10m. The electron drift speed is A) 4.6x1010 m/s B) 1.4x10 m/s C) 18x10 m/s D)5.7x10 m/s E) 1.4x10'm/'s 7· Three uniform cylindrical resistors are made of the same material and have the same length, but different diameters. They are connected in series as shown. We measure the voltage across point O and another point X. X goes from O to the right of the resistors. The measured voltage then changes with the position of X. The ratio of the diameters of the three resistors is d d: dc B) 1:2:3 E) 3:2:1 8. Two resistors R, and R, are connected in parallel. R, 3R. The energy dissipation rate of R, is 10 W. The energy dissipation rate of R, is 9, A battery has em = 3.00 V and internal resistance r 0.500 Ω. Connect this battery with a resistor R=6.00 Ω. In 200 minutes, how inuch energy is dissipated into the thermal energy of the battery? A) 12.8J B) 150J C) 27.7J D) 153J resistance between A and B is A) ¼R E) 166J show'n, 10. Four identical resistors connected R-R-R,-R,sR、 are as The equivalent B) 3/5 R D) R E) 5/2 R

Answer 1

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