Analog Electronics Bipolar Junction Transistors Biasing of Transistors

The average drift velocity vd of electrons in a metal is related to electric field E and collision time τ as

1
\({v_d} = - \frac{{{Q_e}E\tau }}{{{m_e}}}\)
2
vd = - meQeτ
3
\({v_d} = - \frac{{{m_e}{Q_e}\tau }}{{{2_e}}}\)
4
\({v_d} = - \frac{{{Q_e}E\tau }}{{2{m_e}}}\)

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