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Plate voltage of a triode is increased from $200 V$ to $225 V$. To maintain the plate current, change in grid voltage from $5 V$ to $5.75 V$ is needed. The amplification factor is
With a change of load resistance of a triode, used as an amplifier, from $50$ kilo ohms to $100$ kilo ohms, its voltage amplification changes from $25$ to $30.$ Plate resistance of the triode is
For a triode $r_p=10 \ kilo \ ohm$ and $g_m=3 \ milli \ mho$. If the load resistance is double of plate resistance, then the value of voltage gain will be