Question

The collector current Ic is related to the emitter current Ie by a factor k. If b is the transistor parameter then the value of k in terms of b is

(a) k = b/(b + 1)

(b) k = (b + 1)/b

(c) b = (k + 1)/k

(d) None of the mentioned

I have been asked this question by my school teacher while I was bunking the class.

Enquiry is from BJTs Device Strucutres and Physical Operations topic in section Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

Answer 1

The correct answer is (a) k = b/(b + 1)

To elaborate: Ic = k Ie   (given) and also Ie = (b + 1)/b Ic  (standard result).  Equating these two results we get k = b/(b + 1).