4 nR 20 The electric resistance of a certain wire of iron is

Last updated: 6/8/2023

4 nR 20 The electric resistance of a certain wire of iron is R If its length and radius are both doubled then 1 The resistance will be doubled and the specific resistance will be halved 2 The resistance will be halved and the specific resistance will remain unchanged 3 The resistance will be halved and the specific resistance will be doubled 4 The resistance and the specific resistance will both remain unchanged