Question

if the cross sectional area of an aluminium wire is doubled and length remaining same its resistivity will​

Answer 1

Answer:

the resistivity will remain unchanged, but the resistance will become half of the previous one. Because the area of cross section is inversely proportional to the resistance.

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Answer 2

Answer:

If the cross sectional area of an aluminium wire is doubled and length remaining same its resistivity will be doubled.

Explanation:

Mathematically, the resistance (R) of a wire can be expressed as R = ρL/A, where ρ is the resistivity of the material, L is the length of the wire, and A is its cross-sectional area.

Let the resistivity is given by RA/L = ρ,

Doubling the cross-sectional area of the wire means the the new resistivity will given by:-

2RA/L = ρ

So, the new resistivity will doubled.

Resistivity

• Materials with high resistivity, such as insulators, resist the flow of electrical current and have a high resistance. On the other hand, materials with low resistivity, such as conductors, allow for the easy flow of electrical current and have a low resistance.

• The resistivity of a material is influenced by its temperature, composition and structure.

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