Answer:
Initially, the voltage gain\[({{A}_{V}}=-{{g}_{m}}{{R}_{L}})\] increases with the increase in load resistance \[{{R}_{L}}\]. But the gain of an amplifier cannot be increased indefinitely by increasing \[{{R}_{L}}\]. We know that \[{{V}_{CE}}={{V}_{CC}}-{{I}_{C}}{{R}_{L}}\] If we increase \[{{R}_{L}},{{V}_{CE}}\]decreases and if \[{{V}_{CE}}\] becomes less than \[{{V}_{BE}},\] both the junctions get forward biased and saturation starts.
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