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Show on a Graph, the Variation of Resistivity with Temperature for a Typical Semiconductor. - Physics

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प्रश्न

Show on a graph, the variation of resistivity with temperature for a typical semiconductor.

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उत्तर

The following curve shows the variation of resistivity with temperature for a typical semiconductor.

This is because, for a semiconductor, resistivity decreases rapidly with increasing temperature.

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2011-2012 (March) Delhi Set 1

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A semiconductor diode is basically a pn junction with metallic contacts provided at the ends for the application of an external voltage. It is a two-terminal device. When an external voltage is applied across a semiconductor diode such that the p-side is connected to the positive terminal of the battery and the n-side to the negative terminal, it is said to be forward-biased. When an external voltage is applied across the diode such that the n-side is positive and the p-side is negative, it is said to be reverse-biased. An ideal diode is one whose resistance in forward biasing is zero and the resistance is infinite in reverse biasing. When the diode is forward biased, it is found that beyond forward voltage called knee voltage, the conductivity is very high. When the biasing voltage is more than the knee voltage the potential barrier is overcome and the current increases rapidly with an increase in forward voltage. When the diode is reverse biased, the reverse bias voltage produces a very small current of about a few microamperes which almost remains constant with bias. This small current is a reverse saturation current.
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    (b) 20 mA
    (c) 35 mA
    (d) 30 mA
  2. In which of the following figures, the pn diode is reverse biased?
    (a)

    (b)

    (c)

    (d)
  3. Based on the V-I characteristics of the diode, we can classify the diode as:
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    (c) non-ohmic device
    (d) passive element
    OR
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    (a) in the circuits (1) and (2)
    (b) in the circuits (2) and (3)
    (c) in the circuits (1) and (3)
    (d) only in the circuit (1)


  4. The V-I characteristic of a diode is shown in the figure. The ratio of the resistance of the diode at I = 15 mA to the resistance at V = -10 V is
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    (b) 106
    (c) 10
    (d) 10-6

Choose the correct circuit which can achieve the bridge balance.


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