Analog Electronics
The input offset electric current equals the

 average of the two base currents.
 collector electric current divided by the base current.
 difference between the two base-emitter voltages.
 difference between the two base currents.

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Analog Electronics
In all base driver amplifiers

ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage
ac collector voltage is 180° out of phase with ac base voltage
None of these

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