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In a transistor if increase in emitter current is 4 mA and corresponding increase in collector current is 3.5 mA. Find \(\beta\)

a] .875

b] .5

c] 7

d]1

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\(\triangle I_E=4 \)

\(\\ \\ \\ \triangle I_c=3.5 \)

\(\ \\\alpha={\triangle I_c \over \triangle I_E} ={ 3.5\over4}={7\over8} \\ \\\)

\( \beta={ \alpha\over1-\alpha}={{7\over8}\over 1- {7\over8}}=7\)

Hence , option {C} is correct 

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