Question

lf the length and area of cross section of a copper wire is changed guess the changes in specific resistance of copper wire​

Answer 1

Answer:

Explanation:

Resistance= Resistivity x length/area

When the wire is stretched to double the length , the area of cross section gets reduced to half.

So

New Resistance = Resistivity x 2length/area/2

I.e,

New resistance = (Resistivity x length/area)x4

i.e, New resistance = Resistance x 4

So when the wire is stretched, the resistance multiplies by four times.

Hope you understood. Keep exploring.

Answer 2

L Is directly proportional to R and

A is inversely proportional to R

Explanation:

If length will increase or decrease then the R will also increase or decrease.

and if A will increase or decrease then the R will also increase or decrease.

and if L and A will increase or decrease with an equal measurement then R will be same.