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(B) The output resistance $(R_o)$ of a transistor in common emitter configuration is defined as the ratio of the change in collector-emitter voltage $

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$10 \, k\Omega$

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(B) The output resistance $(R_o)$ of a transistor in common emitter configuration is defined as the ratio of the change in collector-emitter voltage $(\Delta V_{CE})$ to the change in collector current $(\Delta I_C)$ at a constant base current.$R_o = \frac{\Delta V_{CE}}{\Delta I_C}$Given:$\Delta V_{CE} = 0.4 \, V$$\Delta I_C = 0.04 \, mA = 0.04 	imes 10^{-3} \, A$Substituting the values:$R_o = \frac{0.4}{0.04 	imes 10^{-3}} = \frac{0.4}{4 	imes 10^{-5}} = 0.1 	imes 10^5 \, \Omega = 10,000 \, \Omega = 10 \, k\Omega$

In the common emitter mode of a transistor, when the collector-emitter voltage is changed by $0.4 \, V$, the collector current changes by $0.04 \, mA$. The output resistance is

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