Question

hey this is Physics question help me out

Answer 1

Let length be L = 10 cm

      l = 20 cm

and radii be R = 1 cm

                    r = 2 cm

Now we know that Resistance(R) =ρ( length) ÷ cross sectional area

R ∝ length ÷ area

Rₐ/ Rb = (L/l) (r/R)²    {π is constant in πr²}

           = (10/20) (2/1)²

           =  (1/2) (4)

            = 2 = 2:1

Hope this helps!