Question

solve plzzzzzzzzzzz​

Answer 1

Answer:40 Ohm

Explanation:

Let length of thicker wire be L1 and that of other be L2.

Also given that, A1:A2=3:1

Or, A1=3A2

Since length is same for both wires, L1=L2

R1={(Rho)L1/A1}=10 Ohm

And R2={(Rho)L2/A2}

For series equivalent, total resistance is

R (equivalent)=R1+R2

={rho*L1/A1}+{rho*L1/A2}

={rho*L1/A1}+{rho*L1/(A1/3)}

=(10+3×10)

=40 Ohm