In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from $200$ volt to $220$ volt and the grid potential is decreased from $-0.5$ volt to $-1.3$ volt. The amplification factor of this valve is
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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
In an experiment, the saturation in the plate current in a diode is observed at $240 V$. But a student still wants to increase the plate current. It can be done, if