Question

Answer it fast if you know
don't spam​

Answer 1

Answer:

Explanation:

LENGTH=250 M

RESISTANCE= 1 OHM

RESISTIVITY= 1.6*10^-8

AREA=?

WE  KNOW,

RESISTANCE=REISTIVITY*LENGTH/ AREA

1= 1.6*10^-8*250/ AREA

AREA=1.6*10^-8*250

         = 400*10^-8

         =4*10^-6 M²

NOW, WHEN THE DIAMETER IS DOUBLED.

OLD AREA= PI*R²=4*10^-6

NEW AREA= PI*4R²= 16*10^-6 M²

NEW RESISTANCE=1.6*10^-8*250/16*10^-6

                                = 25*10^-2 OHMS.

HOPE THIS HELPS.

Answer 2

Explanation:

on doubling the radius or diameter, the resistance is decrease