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Discussion :: Electronic Devices and Circuits

  1. An n type silicon bar 0.1 cm long and 100 μm2 in cross-sectional area has a majority carrier concentration of 5 x 1020/m3 and the carrier mobility is 0.13 m0/V-s at 300k. If the charge of an electron is 1.6 x 10-19 coulomb, then the resistance of the bar is

    2. A.
    106 ohm
    B.
    104 ohm
    C.
    10-1 ohm
    D.
    10-4 ohm

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    Answer : Option C

    Explanation :

    Resistance of bar(R) =

    l = 0.1 cm, A = 100 x 10-6 m2

    σ = neμn + Peμp

    But bar is of n type then it can be approximated to σ = neμn.

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