Question

Ques. Is resistance proportional to length²?
R=L²?

Answer 1

Answer:

yes, resistance is proportional to length sq.

Explanation:

It is because if the length will be double more free electrons will be there, which will result that they will more collide with each other and this will resist the flow of current. By this resistance will be more if the length will be doubled. In the same way, if the length will be half then the resistance will also get half. :)

Answer 2

Answer:

yes in some cases

Explanation:

When a wire is stretched

R=(rho*l)/A.

when a wire is stretched, vol will be const

multiplying and dividing with l

R=(rho*l^2)/l*A

R=(rho*l^2/V)

everything in rhs is constant except l^2

so, r is directly proportional to l^2