Question

In a silicon transistor, a change of `7.89 mA` in the emitter current produce a change of 7.8 mA in the collector current. What change in the base current is necessary to produce an equivalent change in the collector current?
A. 0.9 `mum`
B. 900 `mum`
C. 90 `mum`
D. 9 `mum`

Answer 1

Correct Answer - C
`DeltaI_b=DeltaI_E-DeltaI_C = (7.89-7.8) mA=0.09` mA
`=9xx10^(-2)` mA = `9xx10^(-2) xx 10^(3) muA= 90 muA`