A semiconductor is cooled from $T_1 K$ to $T_2 K$. Its resistance
A
Will decrease
B
Will increase
C
Will first decrease and then increase
D
Will not change
[MP PET 1999]
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B
Will increase
Will increase
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In an NPN transistor circuit, the collector current is $10 mA$. If $90 \%$ of the electrons emitted reach the collector, the emitter current ( $i$ ) and base current $(i)$ are given by