Advertisements
Advertisements
प्रश्न
Two wires of the same material and same length have radii 1 mm and 2 mm respectively. Compare their resistances.
Advertisements
उत्तर
`"R"_1 ∝ 1/(pir_1^2)`
`"R"_2 ∝ 1/(pir_2^2)`
∴ `"R"_1/"R"_2 = (pir_2^2)/(pir_1^2)`
∴ `"R"_1 : "R"_2 = r_2^2 : r_1^2`
= 22 : 12
= 4 : 1
APPEARS IN
संबंधित प्रश्न
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more resistance?
How does the resistance of a wire depend on its length? Give a reason for your answer.
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 |
The effective resistance of three resistors connected in series is lesser than the lowest of the individual resistances.
Two conductors of resistance 2 R and R are connected in series in a battery circuit. The ratio of heat developed In them is ______.
If the area of cross-section of the conductor is doubled its resistance gets ______.
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 |
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
