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Assingment 2

# Assingment 2 - liquid bath the resistance decreases to 97...

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Phys 122 Assignment 2 Due - Feb.08 Name:___________________________ Print full name Show all work. Include diagrams whenever applicable. Place your solutions in the space below each problem. Highlight or box the final answers. It makes it much easier to mark. All assignment pages have to be stapled together WITH A STAPLER . Include units with your final answers. For resistivity data use your textbook. 1. A potential difference of 12 V is found to produce a current of 0.40 A in a 3.2 m length of wire with a uniform radius of 0.40 cm. a) Calculate the resistance R of the wire. [2 marks] b) What is the resistivity of the wire? [3 marks] 2. A copper cable is designed to carry a current of 300 A with a power loss of 2.00 W/m. What is the required radius of this cable? [4 marks] 1

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3. At 40.0 o C, the resistance of a segment of gold wire is 100.0 . When the wire is placed in a

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Unformatted text preview: liquid bath, the resistance decreases to 97 Ω. What is the temperature of the bath? The temperature coefficient of resistivity, α , for gold is 3.4 x 10-3 ( o C)-1 . Hint: First determine the resistance for 20 o C , which is the reference temperature for the resistivity data. . [6 marks] 2 4. For the circuit below: a) Find the equivalent resistance, R eq . [4 marks] b) What is the total current provided by the battery? [2 marks] c) What is the total power provided by the battery? [2 marks] d) What is the total power dissipated by the resistors? [2 marks] 3 5. For the circuit below: a) find the currents I 1, I 2 and I 3 ? [6 marks] b) Find the potential difference between points a and b in the diagram. Which point has a higher potential. [1 mark] I 1 I 2 I 3 V b – V a Point _____ has a higher potential. 4 5...
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