In a study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98. The collector current is 3 mA , then base current will be approximately

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i c ​ i c ​ ​ = 0.98 i c ​ = 3 mA i b ​ = ? i c ​ + i b ​ i c ​ ​ = 0.98 = 100 98 ​ ⇒ i c ​ i c ​ + i b ​ ​ = 98 100 ​ 1 + i c ​ i b ​ ​ = 98 100 ​ ∴ i c ​ i b ​ ​ = 98 2 ​ ∴ i b ​ = 3 × 98 2 ​ = 49 3 ​ mA = 49 3000 ​ μ A = 61.22 μ A ≈ 60 μ A

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