Some of the characterising parameters of a materials 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 anotherincreases the conductivity. These two parameters are respectively:

Some of the characterising parameters of a materials are: 1. magnetic

1.	Some of the characterising parameters of a materials 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 anotherincreases the conductivity. These two parameters are respectively:
A.	1 and 3
B.	3 and 2
C.	4 and 3
D.	1 and 2
Answer» C. 4 and 3

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