railway DFCCIL Executive 2025 Mock Test Analog Electronics Bipolar Junction Transistors

BJT में α और β किस अभिव्यक्ति से संबंधित हैं?

1
\(\alpha = \frac{1}{{1 - \beta }}\)
2
\(\alpha = \frac{1}{{1 + \beta }}\)
3
\(\alpha = \frac{\beta }{{1 - \beta }}\)
4
\(\alpha = \frac{\beta }{{1 + \beta }}\)
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