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(D) In a common emitter $(CE)$ configuration of a transistor amplifier,the input signal is applied between the base and the emitter,while the output i

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$\pi^c$

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(D) In a common emitter $(CE)$ configuration of a transistor amplifier,the input signal is applied between the base and the emitter,while the output is taken across the collector and the emitter.When the input signal voltage increases,the base current increases,which in turn increases the collector current.Due to the voltage drop across the load resistor $R_L$ connected in the collector circuit $(V_{out} = V_{CC} - I_C R_L)$,an increase in collector current $I_C$ leads to a decrease in the output voltage $V_{out}$.Since an increase in input voltage results in a decrease in output voltage,the output signal is inverted with respect to the input signal.An inverted signal corresponds to a phase shift of $180^\circ$ or $\pi^c$ radians.

In a common emitter transistor amplifier,the output voltage and input voltage have a phase difference of

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