Question

How the resistance of a wire will change if its area of cross section and length both becomes double

Answer 1

Answer:

Resistance remains same.

Explanation:

Resistance = resistivity× length/area

Let this resistance= R,

Length=L

Area=A

If length and area becomes double,

New resistance = resistivity×2L/2A(resistivity is same because same material is used)

New resistance= resistivity×L/A

So, it remains same as the first one.