In a silicon transistor, a change of 8 mA in emitter current produces a change of 7.8 mA in the collector current. What change in base current is necessary to produce an equivalent change in collector current?

In a silicon transistor, a change of 8 mA in emitter current produces a change of 7.8 mA in the collector current. What change in base current is necessary to produce an equivalent change in collector current? Correct Answer 0.2 mA

Concept:

In a transistor, emitter current is calculated as

I_E = I_C + I_B

Also,  ∆IE = ∆IC + ∆IB

Where, 

∆I_E =  Change in emitter current

∆I_C =  Change in collector current

∆I_B =  Change in base current

Calculation:

Given-

∆IE = 8 mA, ∆IC = 7.8 mA

∴ ∆I_B = 8 - 7.8 = 0.2 mA

∆I_B = 0.2 mA