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The amplification factor of a triode valve is $15.$ If the grid voltage is changed by $0.3$ volt the change in plate voltage in order to keep the plate current constant (in volt) is
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
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