[Drift velocity] Factors affecting velocity

AI Thread Summary
Charge density in a specific material, such as copper, remains constant regardless of the material's size. Increasing the cross-sectional area of a wire does not affect drift velocity because it primarily influences resistance rather than the intrinsic properties of charge carriers. The distinction between resistance and resistivity is crucial; resistance depends on the wire's dimensions, while resistivity is a material property. Understanding these differences is essential for grasping how drift velocity is affected by various factors. Overall, drift velocity is influenced by charge density and resistivity rather than just the physical dimensions of the wire.
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1. Is the charge density (No. of charges/volume) constant for a specific material ? e.g. Copper has a constant charge density no matter how big it is ?

2. Why someone told me that increasing the cross-sectional area of a wire will not affect its drift velocity ? The resistance will be reduced and the electrons can move faster, isn't it ?
 
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You need to learn the difference between "resistance" and "resistivity". This is the same as the issue between "mass" and "density". One requires the knowledge of a volume of the object, the other doesn't.

Zz.
 

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