Answer & explanation
Correct answer: option 2
$ \Delta I_C = 10mA , \Delta I_E = \frac{10mA}{0.8} = 12.5 mA$
$\Rightarrow \Delta I_B = \Delta I_E - \Delta I_C = 2.5mA$
Correct answer: option 2
$ \Delta I_C = 10mA , \Delta I_E = \frac{10mA}{0.8} = 12.5 mA$
$\Rightarrow \Delta I_B = \Delta I_E - \Delta I_C = 2.5mA$