A junction transistor with β = 49 and ICO = ICBO = 1 µA

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A junction transistor with β = 49 and I_CO = I_CBO = 1 µA has I_B = 10 µA. The value of I_C is given in µA by—

1. 441
2. 490
3. 539
4. 540

Correct Option: D

We know that the collector current is given by the relation
I_C = βI_B + (1 + β) I_CO
= 49 × 10. 10^{– 6} + (1 + 49) 1 × 10^{– 6}
= (490 + 50) × 10^{– 6} = 540 µA.