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.

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  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

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