Question

In common emitter amplifier, a change of 0.2 mA in the base current causes a change of 5 mA in the collector current. If input resistance is 2K `Omega` and voltage gain is 75, the load resistance used in the circuit is ______.

पर्याय

• 4K `Omega`

• 1K `Omega`

• 6K `Omega`

• 2K `Omega`

Answer 1

6K `Omega`

Explanation:

Voltage gain A = `beta` `"R"_"o"/"R"_1` where `beta` = `(Delta "I"_"c")/(Delta "I"_"b") = 5/0.2 =25`

`"R"_"o" = ("A"."R"_"i")/beta =( 75 xx 2 xx 10^3)/25 = 6 xx 10^3  Omega = 6  "K" Omega`