Advertisements
Advertisements
Question
How does the resistance of a wire depend on its radius? Explain your answer.
Advertisements
Solution
Resistance of a wire is inversely proportional to the area of cross-section of the wire.
`R ∝ 1/"r"^2 or R prop 1/"a" or R ∝ 1/"𝜋𝑟"^2`
where 'a' is the area of cross-section and r is the radius of wire and R is the resistance. In other words thick wire offers less resistance and thin wire offers more resistance. In thick conductor electrons suffer less collisions.
APPEARS IN
RELATED QUESTIONS
Two copper wires are of the same length, but one is thicker than the other. Which wire will have more resistance?
What happens to the resistance, as the conductor is made thicker?
The resistance of a straight conductor is independent of ______.
The resistance of a conductor is R. If Its length is doubled, then its new resistance will be ______.
Resistors are connected in series if the resistance of the electric circuit is to be ______.
The process of conduction of electric current through the solution is called ______.
A rheostat is also known as fixed resistance.
Define the following:
Fixed 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
Define the term resistance.
