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
How are the home appliances connected in general, in series or parallel. Give reasons.
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 |
What is resistance?
______ 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 ______ is the measure of opposition offered by the component to the flow of electric current through it.
Define the following:
Variable resistor
Observe the given circuit diagram and answer the questions that follow:
- Calculate the resistance of the circuit when the key K completes the circuit.
- Calculate the current through 3Ω resistance when the circuit is complete.
Define the term resistance.
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more specific resistance?
