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प्रश्न
Name three factors on which resistance of a given wire depends and state how is it affected by the factors stated by you.
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उत्तर
The following factors can affect a wire's resistance:
- Length of wire: The resistance increases as the wire length increases. R ∝ (l) (directly proportional).
- Area of cross-section (a): The area of the cross-section has an inverse relationship with resistance. For example, the resistance of a thick wire is lower than that of a thin one.
- Temperature (T): As the temperature rises, the resistance of the wire also rises.
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संबंधित प्रश्न
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their resistances.
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Reason (R): Copper has very low electrical resistance.
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- Calculate the resistance of the bulb.
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Match the following:
| Column I | Column II | ||
| 1. | Resistor | a. | Galvanometer |
| 2. | Connecting wire | b. | Voltmeter |
| 3. | Current in an electric circuit | c. | Copper |
| 4. | Potential difference | d. | Constantan |
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