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Physics · PYQ NEET UG 2016(2)
हिन्दीFor CE transistor amplifier, the audio signal voltage across the collector resistance of \( 2\text{ k}\Omega \) is \( 4\text{ V} \). If the current amplification factor of the transistor is \( 100 \) and the base resistance is \( 1\text{ k}\Omega \), then the input signal voltage is
Correct answer · Option 3
\( 20\text{ mV} \)
Explanation
Collector current \( i_c = \frac{v_c}{R_c} = \frac{4\text{ V}}{2\text{ k}\Omega} = 2\text{ mA} \). Base current \( i_b = \frac{i_c}{\beta} = \frac{2\text{ mA}}{100} = 0.02\text{ mA} \). Input voltage \( v_i = i_b R_b = (0.02\text{ mA})(1\text{ k}\Omega) = 0.02\text{ V} = 20\text{ mV} \).
