A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 10 mV is added to the base-emitter voltage, the base current changes by 10 μ A and the collector current changes by 1 . 5 mA . The load resistance is 5 k Ω . The voltage gain of the transistor will be _____ .

Step-by-step solution

First, use the formula of current gain in terms of change in base current, and collector current, β = Δ I c Δ I B given, V B E = 10 × 10 - 3   V ,   ∆ i b = 10 × 10 - 6   A , ∆ i c = 1 . 5 × 10 - 3   A and R L = 5 × 10 3   Ω So the formula of voltage gain, β V = ∆ V C E ∆ V B E = ∆ i c × R L ∆ V B E ⇒ β V = 1 . 5 × 10 - 3 × 5000 10 × 10 - 3 = 750