Some of the characterizing parameters of a material are:

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Some of the characterizing parameters of a material are:
1. magnetic permeability.
2. electron relaxation time.
3. electron effective mass.
4. energy band gap.
In case of metals, increase in one of the above parameters decreases its conductivity, while increase in another increases the conductivity. These two parameters are repectively:

1. 1 and 3
2. 3 and 2
3. 4 and 3
4. 1 and 2

Correct Option: B

NA