1) a wire of length 1m has a resistance of 2 ohm.obtain the resistance if specific resistance is double,diameter is double and the length is made three times of the first.

Answer 1

specific r double ---> double r
diameter doubles --> resistance 1/4
lenght * 3 ----> r *3
2/4*3 = 3/2
3/2 * 2 ohms = 3 ohms

Answer 2

what happened