Question:
The current gain of a transistor in common emitter mode is $49$. The change in collector current and emitter current corresponding to the change in base current by $5.0 \,\mu A, $ will be
The current gain of a transistor in common emitter mode is $49$. The change in collector current and emitter current corresponding to the change in base current by $5.0 \,\mu A, $ will be
Updated On: Jun 18, 2022
- $45 \,\mu A, 250 \,\mu A $
- $240 \,\mu A, 235 \,\mu A $
- $260 \,\mu A, 255 \,\mu A $
- None of the above
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The Correct Option is A
Solution and Explanation
Current gain, $\beta=\frac{\Delta I_{C}}{\Delta I_{B}}$
where $\Delta I_{C}$ is change in collector current
and $\Delta I_{B}$ is change in base current.
$\therefore \Delta I_{C}=\beta \Delta I_{B}=49 \times 5=245\, \mu A$
Also, $ \Delta I_{E}=\Delta I_{B}+\Delta I_{C}$
$=(245+5) \mu A=250 \,\mu A$
where $\Delta I_{C}$ is change in collector current
and $\Delta I_{B}$ is change in base current.
$\therefore \Delta I_{C}=\beta \Delta I_{B}=49 \times 5=245\, \mu A$
Also, $ \Delta I_{E}=\Delta I_{B}+\Delta I_{C}$
$=(245+5) \mu A=250 \,\mu A$
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Concepts Used:
Semiconductors
Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.
Properties of Semiconductor:
- Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
- Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
- Lesser power losses.
Uses of Semiconductor:
- Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
- Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.