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Solutions to Problem set on Chapter 26

# Solutions to Problem set on Chapter 26 - Problems on...

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Problems on Chapter 26 (due at 9 am on Tuesday 29 June) 1. A lead wire of resistance R is drawn through a die so that its length is doubled, while its volume remains unchanged. What will be its new resistance in terms of its initial resistance? 2. A hair dryer draws 9.5 A when plugged into a 120 V line. i. What is its resistance? ii. How much charge passes through it in 15 min? 3. A metallic wire has a diameter of 4.12 mm. When the current in the wire is 8.00 A, the drift velocity is 5.40 x 10 -5 m/s. What is the density of free electrons in the metal? 4. (i) What is the resistance of a Nichrome wire at 0.0°C if its resistance is 100.00 Ω at 11.5 °C? (ii) What is the resistance of a carbon rod at 25.8°C if its resistance is 0.0160 Ω at 0.0°C? 5. Textbook: Problem 13 (Page 701) 6. Textbook: Problem 30 (Page 702) 7. Textbook: Problem 53 (Page 703)

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Solutions to Problems from Chapter 26 Question 1 𝑅𝑅 0 = 𝜌𝜌 𝐿𝐿 𝐴𝐴 𝑅𝑅 2 = 𝜌𝜌 2 𝐿𝐿 𝐴𝐴 /2 = 4 𝜌𝜌 𝐿𝐿 𝐴𝐴 = 4 𝑅𝑅 0 Δ𝑄𝑄 = 𝐼𝐼Δ𝑡𝑡 = (9.5 𝐴𝐴 )(15 𝑥𝑥
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Solutions to Problem set on Chapter 26 - Problems on...

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