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The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is

1. 0.29 mA
2. 0.35 mA
3. 0.39 mA
4. 0.43 mA

Correct answer: 0.35 mA

Solution

The current gain (α) is given as 0.96, and emitter current (I_E) is 7.2 mA. Using the relation I_E = I_C + I_B and I_C = α * I_E, we calculate I_B = I_E - I_C = I_E - (α * I_E). Substituting values, I_B = 7.2 - (0.96 * 7.2) = 0.35 mA.

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