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(a) In the given'S' is a semiconductor. Would you increase or decrease the value of R to keep the reading of the ammeter A constant when S is heated ? Give reason for your answer. (b) Draw the circuit diagram of a photodiode and explain its working. Draw its 1-V characteristics. |
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Answer» Solution :(a) When semiconductor S is heated, we shall INCREASE the value of resistance R so as to keep the reading of the ammeter (i.e., the current flowing in the CIRCUIT) constant. On HEATING the TEMPERATURE of semiconductor increases and its resistance decreases. To maintain total resistance of circuit constant we increase R and so ammeter reading may remain UNCHANGED. (b) See Short Answer Question Number 21. 
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