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Define the term 'mobility' of charge car...

Define the term 'mobility' of charge carriers. Write its S.I. unit.

Text Solution

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Mobility is defined as the magnitude of the drift velocity per unit electric field.
`mu=(|V_d|)/E=(alphatau)/E=(eE)/m tau/E=e/m tau`
where`tau` is the average collision time for electrons.
The SI unit of mobility is `m^2//Vs` or `m^2V^(-1)S^(-1)`
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Knowledge Check

  • Mobility of charge carrier in conductor is

    A
    directly proportional to E, Inversely proportional to `v_d`
    B
    inversely proportional to E, directly proportional to `v_d`
    C
    directly proportional to both `v_d` and E
    D
    Inversely proportional to both `v-d` and E

  • The dimensions of mobility of charge carriers are

    A
    `[M^(-2)T^(2)A]`
    B
    `[M^(-1)T^(2)A]`
    C
    `M^(-2)T^(3)A]`
    D
    `[M^(-1)T^(3)A]`

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