In a common emitter transistor amplifier, the output resistance is 500 KΩ and the current gain \beta=49. If the power gain of the amplifier is 5\times10^6, the input resistance is

KEAM 2011 Physics and Chemistry Paper

Question : 23 of 120

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In a common emitter transistor amplifier, the output resistance is 500 KΩ and the current gain β=49. If the power gain of the amplifier is 5×106, the input resistance is

325 Ω
165 Ω
198 Ω
225 Ω
240 Ω

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