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For CE transistor amplifier, the audio signal voltage across the collector resistance of 2k $\Omega$ is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is I k$\Omega$, then the input signal voltage is

(a) 10 mV                  (b) 20 mV

(c) 30 mV                  (d) 15 mV

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