If, µe = electron mobility µh = hole mobility ηe =

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If, µ_e = electron mobility
µ_h = hole mobility
η_e = electron density
η_h = hole density
then for the measurement of the hall coefficient of a semiconductor with two types of charge carriers would give the value of Hall coefficient as positive if:

1. µ_hη_h > µ_eη_e
2. µ_hη_h > µ_eη_e²
3. µ_h² η_n > µ_e² η_e²
4. µ_h² η_h² > µ_e² η_e²

Correct Option: A

NA