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Question
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
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Solution
We know that the specific resistance(ρ) does not depend on the length or thickness of the wire. It depends upon the material used. It will be the same in this case.
RELATED QUESTIONS
Name three factors on which resistance of a given wire depends and state how is it affected by the factors stated by you.
Assertion (A): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.
Resistance of a wire depends on, ______.
Exercise.
The values of current (I) flowing through a resistor for various potential differences V across the resistor are given below. What is the value of resistor?
| I (ampere) | 0.5 | 1.0 | 2.0 | 3.0 | 4.0 |
| V (volt) | 1.6 | 3.4 | 6.7 | 10.2 | 13.2 |
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The resistance of a conductor is R. If Its length is doubled, then its new resistance will be ______.
A rheostat is also known as fixed resistance.
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 |
Define the following:
Fixed resistor
Define the term resistance.
