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JEE Main 20179 AprilOnline

Exam: JEE Main
Year: 2017
Date: 9 April
Mode: Online
Subject: Physics
Chapter: Semiconductors

JEE Main 2017 · 9 April · Online · Physics · Semiconductors

The current gain of a common emitter amplifier is 69 . If the...

The current gain of a common emitter amplifier is

69

. If the emitter current is

7 . 0mA

, collector current is :

Options

A $69mA$
B $0 . 69mA$
C $6 . 9mA$
D $9 . 6mA$

Correct answer

C. $6 . 9mA$

Step-by-step solution

\beta = 69 = \dfrac{{I}_{C}}{{I}_{B}}

\alpha = \dfrac{\beta}{1 + \beta} = \dfrac{69}{70} = \dfrac{{I}_{C}}{{I}_{E}}

{I}_{C} = {I}_{E} \times \dfrac{69}{70}

{I}_{C} = \dfrac{69}{70} \times 7

{I}_{C} = 6.9mA

.

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