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(B) The input characteristic of a common emitter transistor is the variation of base current $(I_B)$ with base-emitter voltage $(V_{BE})$ at a constan

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(B) The input characteristic of a common emitter transistor is the variation of base current $(I_B)$ with base-emitter voltage $(V_{BE})$ at a constant collector-emitter voltage $(V_{CE})$.As $V_{CE}$ increases,the depletion region at the collector-base junction widens,which reduces the effective base width. This phenomenon is known as the Early effect.Due to the reduction in effective base width,the recombination of charge carriers in the base region decreases,which leads to a decrease in the base current $(I_B)$ for a given $V_{BE}$.Therefore,for a higher $V_{CE}$ (e.g.,$20V$),the $I_B$ vs $V_{BE}$ curve shifts to the right compared to a lower $V_{CE}$ (e.g.,$0V$).This means that for a fixed $V_{BE}$,the base current $I_B$ is lower at $20V$ than at $0V$.

The graph of the input characteristic of a common emitter amplifier is:

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