In a transistor configuration $\beta$-parameter is
A$\frac{l_b}{l_c}$
B$\frac{l_c}{l_b}$
C$\frac{l_c}{l_a}$
D$\frac{l_a}{l_c}$
[Orissa PMT 2004]
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B$\frac{l_c}{l_b}$
$\beta=\frac{i_c}{i_b}$
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