Question

# For whatever reason, the relaxation time of a conductor increases by a factor of 2 and the number of electrons per unit volume decreases by a factor of 3. Given all other factors remain the same, the new conductivity changes by what factor?1623632

Solution

## The correct option is B 23If you don’t remember the exact relation of conductivity, number density and relaxation time it’s cool, just remember that conductivity increases linearly with both number density (n) and  relaxation time (τ). The relation is If relaxation time increases by 2 times, so does conductivity and if number density decreases by 3 times so does conductivity. So overall conductivity changes by a factor of 23

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