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The diagram Fig.12 shown a piece of pure...

The diagram Fig.12 shown a piece of pure semiconductor S in series with a variable resistor R, and a source of constant voltage V. Would you increase or decrease the value of R to keep the reading of ammeter constant, when semi-conductor S is heated? Give reason.

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when a semiconductor is heated its resistance decreases and hence current in circuit increases. To keep the current in circuit constant, the value of resistance is to be increased.
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