NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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Application +4 | -1

While a collector to emitter voltage is constant in a transistor, the collector current changes by

8.2\;mA

when the emitter current changes by

8.3\;mA

. The value of forward current ratio

{h_{fe}}

View answer and explanation

Correct option: A

Option A (82) is correct because it is the calculated forward current ratio using the given changes in collector and emitter currents.

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I = A{T^2}{e^{q/{V_L}}}

{V_L}

\sqrt{n}.

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{10^{17}}\mathrm{c}{\mathrm{m}^{ - 3}}

P

{10^{16}}

\mathrm{c}{\mathrm{m}^{ - 3}}

N

kT =

{n_i} = 1.4 \times {10^{10}}

\mathrm{c}{\mathrm{m}^{ - 3}}