4. The current density is defined as a. current per unit cross-sectional area b.

Question

4. The current density is defined as a. current per unit cross-sectional area b. current per unit volume c. charge per unit cross-sectional area d. charge per unit time Ans. 5. When two or more resistors are connected end to end, they are said to be a. in parallel b. in series c. both series and parallel d. none Ans. 6. As more resistors are added in parallel across a constant voltage source, the voltage supplied by the source a. increase. b. decreases. c. does not change. d. first increases and then decreases Ans. 7. A 200 platinum wire at 20 degree C with a temperature coefficient of resistivity of 3.9 x 10^-3(degreeC)^-1 will have what resistance at 100 degree C? a. 14 ohm b. 20ohm c. 26 ohm d. 28 ohm

Explanation / Answer

my answer is 4)A 5)C 6)B 7)A

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