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| 1. | Alloys of metals usually have less resistivity than that of their constituent metals. |
| 2. | Alloys usually have much higher temperature coefficients of resistance than pure metals. |
| 3. | The resistivity of the alloy manganin is nearly independent with an increase of temperature. |
| 4. | The resistivity of a typical insulator (e.g., amber) is less than that of a metal by a factor of the order of 10 22 / 10 23 . |
Subtopic: Â Derivation of Ohm's Law |
 54%
Level 3: 35%-60%
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A negligibly small current is passed through a wire of length \(15~\text{m}\) and uniform cross-section \(6.0\times10^{-7}~\text{m}^2,\) and its resistance is measured to be \(5.0~\Omega.\) What is the resistivity of the material at the temperature of the experiment?
| 1. | \(1\times 10^{-7}~\Omega\text{m}\) | 2. | \(2\times 10^{-7}~\Omega\text{m}\) |
| 3. | \(3\times 10^{-7}~\Omega\text{m}\) | 4. | \(1.6\times 10^{-7}~\Omega\text{m}\) |
Subtopic: Â Derivation of Ohm's Law |
 87%
Level 1: 80%+
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A silver wire has a resistance of \(2.1~\Omega\) at \(27.5^\circ \text{C},\) and a resistance of \(2.7~\Omega\) at \(100^\circ \text{C}.\) The temperature coefficient of resistivity of silver is:
| 1. | \(0.0033^\circ \text{C}^{-1}\) | 2. | \(0.039^\circ \text{C}^{-1}\) |
| 3. | \(0.0039^\circ \text{C}^{-1}\) | 4. | \(0.033^\circ \text{C}^{-1}\) |
Subtopic: Â Derivation of Ohm's Law |
 69%
Level 2: 60%+
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