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

Step-by-step 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 (1)/(d^2)`

whee L and d are length and Diameter

thus
`R=k (L)/(d^2)`

where k=constant of Variation