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Question
Which of the following quantity does not affect the resistance of a wire?
Which of the following quantity does not affect the resistance of a wire?
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Solution
The correct option is C Density
Resistance (R) of wire is given as,
R =ρ LA
Where,
ρ = Resistivity of the wire
L = Length of the wire
A = Cross-sectional area of the wire
Since, resistivity depends on temperature, resistance of a wire is affected by temperature change. Generally the resistivity of metals increases with increase in temperature.
Resistance (R) of wire is given as,
R =ρ LA
Where,
ρ = Resistivity of the wire
L = Length of the wire
A = Cross-sectional area of the wire
Since, resistivity depends on temperature, resistance of a wire is affected by temperature change. Generally the resistivity of metals increases with increase in temperature.
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