Advertisements
Advertisements
Question
How does the resistance of a wire depend on its radius? Explain your answer.
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
How does the resistance of a wire depend on its length? Give a reason for your answer.
Draw a I–V graph for a linear resistor. What does its slope represent?
Assertion (A): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.
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 ______.
Resistors are connected in series if the resistance of the electric circuit is to be ______.
The ______ is the measure of opposition offered by the component to the flow of electric current through it.
The process of conduction of electric current through the solution is called ______.
A rheostat is also known as fixed resistance.
Define the term resistance.
