OU DON\'T NEED TO SHOW WORK ON MULTIPLE CHOICE. EVERYTHING ELSE IS SHORT ANSW R.
ID: 306360 • Letter: O
Question
OU DON'T NEED TO SHOW WORK ON MULTIPLE CHOICE. EVERYTHING ELSE IS SHORT ANSW R. Which one of the following statements concerning resistance is true? A) The resistance of a semiconductor increases with temperature. 8) Resistance is a property of resistors, but not conductors. C) The resistance of a metal wire changes with temperature. D) The resistance is the same for all samples of the same material. E) The resistance of a wire is inversely proportional to the length of the wire. A physics student performed an experiment in which the potential difference V between the ends of a long straight wire was varied. The current / in the wire was measured at each value of the potential difference with an ammeter and the results of the experiment are shown in the table. 6. rial(ols) I(amperes) 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 0.25 0.50 0.75 1.00 1.50 1.63 1.55 1.53 6 Which one of the following statements is the best conclusion based on the data? A) The resistance of the wire is 202. B) The wire never obeys Ohm's law C) The current in the wire is directly proportional to the applied potential difference D) The wire obeys Ohm's law over the range of potential differences between 5 and 30 V E) The wire obeys Ohm's law over the range of potential differences be 7. A 3.5-A current is maintained in a simple circuit with a total resistance of 1500 2. What net charge passes through any point in the circuit during a thirty second interval? Which one of the following statements concerning permanent magnets is FALSE? A) The north pole of a permanent magnet is attracted to a south pole. B) All permanent magnets are surrounded by a magnetic field. C) The direction of a magnetic field is indicated by the north pole of a compass. D) Magnetic field lines outside a permanent magnet originate from the north pole a pole. E) When a permanent magne pole. 8. nd end on the south et is cut in half, one piece will be a north pole and one piece will be a south SCOREExplanation / Answer
5) (C) the resistance of a metal wire changes with temperature.
6) (E) The wire obey's Ohm's law over the range of potential differences between 5 and 20V.
7) We have,
Q = It
= 3.5*30
= 105 C
8) (E)
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