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In a transistor, β=75 and Ic=53 mA. The value of IB is _____________

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In a transistor, β=75 and Ic=53 mA. The value of IB is _____________

(a) .70 mA

(b) .25 mA

(c) .26 mA

(d) .15 mA

The question was posed to me in unit test.

This interesting question is from Solid-State Devices in portion Introduction to Solid-State Devices of Electric Drives

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Correct choice is (a) .70 mA

The best I can explain: The value of β is Ic÷IB. The value of IB=IE-Ic. The value of IB is Ic÷β=53÷75=.70 mA. The relationship between β and ∝ is β=∝/(1-∝).

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