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प्रश्न
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more resistance?
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उत्तर १
We know that,
R = `ρl/A`
Where, ρ = specific resistance
L = length of wire
A = area of cross-section
let the area of the cross-section of the wires be A1 & A2. It is said that one is thicker than the other.
So A1 > A2
When the length of the wire is given to be the same then we can see that `R prop 1/A`.
So, the wire with less area of the cross-section will have more resistance.
उत्तर २
The area of the cross-section has an inverse relationship to resistance, so a thinner wire will have more resistance.
संबंधित प्रश्न
How does the resistance of a wire depend on its length? Give a reason for your answer.
Name three factors on which resistance of a given wire depends and state how is it affected by the factors stated by you.
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 |
______ is the only non-metal that is a good conductor of electricity.
Three resistors are connected in parallel with a battery. If the current in each resistor is 2A, then the current through the battery will be ______.
The process of conduction of electric current through the solution is called ______.
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:
Variable resistor
|
5 bulbs are connected in series in a room. One bulb is fused. It is removed and remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the following physical quantities? (Increases, Decreases, Remain Same). |
- Resistance
- Intensity of light
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
