To a germanium sample, traces of gallium are added as an impurity. The resultant sample would behave like
A
A conductor
BA $P-$type semiconductor
CAn $N-$type semiconductor
DAn insulator $\text{[MP PMT 2001]}$
[AIIMS 2003]
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BA $P-$type semiconductor
A $P-$type semiconductor
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Wires $P$ and $Q$ have the same resistance at ordinary (room) temperature. When heated, resistance of $P$ increases and that of $Q$ decreases. We conclude that