In a transistor, a change of $8.0 mA$ in the emitter current produces a change of $7.8 mA$ in the collector current. What change in the base current is necessary to produce the same change in the collector current
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The width of forbidden gap in silicon crystal is $1.1\ eV$. When the crystal is converted in to a $N$-type semiconductor the distance of Fermi level from conduction band is
For a transistor, the current amplification factor is $0.8.$ The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 $m A$ is
Plate resistance of two triode valves is $2 k \Omega$ and $4 k \Omega$, amplification factor of each of the valves is $40.$ The ratio of voltage amplification, when used with $4 k \Omega$ load resistance, will be