JEE Main · 2006 · 30 Apr 2006 · Offline · Semiconductors

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In a common base mode of a transistor, t collector current is 5.488 mA for an emit current of 5.60 mA. The value of the base current amplification factor

(β)

will be

(A)48
(B)49✓ Correct
(C)50
(D)51

Answer: (B)

Solution

In common-base operation the current gain is

α = \frac{I _{C}}{I _{E}} = \frac{5.488}{5.60} = 0.98

. The common-emitter current amplification factor is then

β = \frac{α}{1 - α} = \frac{0.98}{1 - 0.98} = \frac{0.98}{0.02} = 49

JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option

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