In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of
A$1\ MeV$
B$0.1 \ MeV$
C$1\ eV$
D$5\ eV$
[DPMT 1988; EAMCET (Engg.) 1995; MP PET 1996]
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D$5\ eV$
In insulators, the forbidden energy gap is largest and it is of the order of $6 \mathrm{eV}$.
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Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is $100.$ If the collector current changes by $1\ mA$, what will be the change in emitter current