Question

For a given transistor, if β = 200, the value of α will be (almost) equal to 

(1) 0.0

(2) 1.0

(3) 200 

(4) 201 

Answer 1

Correct option: (2)

Explanation: 

This is so because α is the current gain in the common base configuration. It equals ΔI_c/ΔI_E and is always less than unity.

'β', on the other hand, is the current gain in the common–emitter configuration. It equals ΔI_c/ΔI_B. Remembering that ΔI_E = (ΔI_c + ΔI_B),  we get the given relation between α and β.