Question

The resistance (R) of a copper wire varies directly as its length (L). Write this relation as a formula using k as the constant of variation.

Answer 1

Answer:

Explanation:

According to ohm's law current flowing in a conductor is directly proportional to the voltage applied across two end of conductor.

i.e. $V\propto R$

$V=R I$

where R=resistance

$R\propto L$

$R\propto \frac{1}{d^2}$

whee L and d are length and Diameter

thus $R=k \frac{L}{d^2}$

where k=constant of Variation