Two wires A and B are made up of the same material and have the same mass. Wire A has radius of 2.0 mm and wire B has radius of 4.0 mm. The…

Two wires $\displaystyle A$ and $\displaystyle B$ are made up of the same material and have the same mass. Wire $\displaystyle A$ has radius of $\displaystyle 2.0$ mm and wire $\displaystyle B$ has radius of $\displaystyle 4.0$ mm . The resistance of wire $\displaystyle B$ is $\displaystyle 2 \Omega$. The resistance of wire $\displaystyle A$ is $\displaystyle \_\_\_\_$ $\displaystyle \Omega$.