PhyIIHW5 - hopkins(tlh982 HW 05 criss(4908 This print-out...

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hopkins (tlh982) – HW 05 – criss – (4908) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A 3 . 1 cm length of tungsten filament in a small lightbulb has a resistance of 0 . 031 Ω. Find its diameter. (The resistivity is 5 . 6 × 10 8 Ω · m). Answer in units of mm. 002 10.0 points A length of copper wire has a resistance 32 Ω. The wire is cut into three pieces of equal length. The pieces are then connected as parallel lengths between points A and B. What resistance will this new “wire” of length L 0 3 have between points A and B? Answer in units of Ω. 003 10.0 points A 11 V battery delivers 116 mA of current when connected to a 74 Ω resistor. Determine the internal resistance of the battery. Answer in units of Ω. 004 10.0 points A platinum resistance thermometer has a re- sistance of 200 Ω when placed in a ice 0 C bath and 169 Ω when immersed in a crucible containing a melting substance. What is the melting point of the substance? The temperature coefficient of the platinum is 0 . 00392( C) 1 . Answer in units of C. 005 (part 1 of 4) 10.0 points An energy plant produces an output potential of 4300 kV and serves a city 176 km away. A high-voltage transmission line carries 690 A to the city. The effective resistance of a trans-
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