In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the

Name: Problem 2929, Chapter 40: JEE Physics
Uploaded: 2021-10-05T04:07:31-08:00
Duration: 1 min 9 s
Channel: Narayan Hari
Description: In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. What change in the base current is necessary to produce the same change in the collector current? (A) 300 μA (B) 400 μA (C) 200 μA (D) 100 μA

step 1 In this problem, I can write the value of alpha as del IC by del i .e, which is equal to 7 .8 by

Question

In a transistor, a change of $8.0 \mathrm{~mA}$ in the emitter current produces a change of $7.8 \mathrm{~mA}$ in the collector current. What change in the base current is necessary to produce the same change in the collector current? (A) $300 \mu \mathrm{A}$ (B) $400 \mu \mathrm{A}$ (C) $200 \mu \mathrm{A}$ (D) $100 \mu \mathrm{A}$

   In a transistor, a change of $8.0 \mathrm{~mA}$ in the emitter current produces a change of $7.8 \mathrm{~mA}$ in the collector current. What change in the base current is necessary to produce the same change in the collector current?
(A) $300 \mu \mathrm{A}$
(B) $400 \mu \mathrm{A}$
(C) $200 \mu \mathrm{A}$
(D) $100 \mu \mathrm{A}$

JEE Physics

StemEZ 1st Edition

Chapter 40, Problem 2929

Instant Answer

Solved by Expert Narayan Hari

10/05/2021

Step 1

0 \mathrm{~mA}$ in the emitter current produces a change of $7.8 \mathrm{~mA}$ in the collector current. This gives us the value of the transistor current gain $\alpha$ as $\frac{\Delta I_C}{\Delta I_E} = \frac{7.8}{8} = 0.975$. Show more…

Show all steps

Thanks for your feedback!

In a transistor, a change of $8.0 \mathrm{~mA}$ in the emitter current produces a change of $7.8 \mathrm{~mA}$ in the collector current. What change in the base current is necessary to produce the same change in the collector current? (A) $300 \mu \mathrm{A}$ (B) $400 \mu \mathrm{A}$ (C) $200 \mu \mathrm{A}$ (D) $100 \mu \mathrm{A}$

Play audio

Feedback

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Transistor Current Relationships

In a bipolar junction transistor, the emitter current is the sum of the base current and the collector current (I_E = I_B + I_C). This fundamental relationship ensures conservation of charge and is key to analyzing how changes in one current affect the others.

Differential Current Analysis

When dealing with small changes in transistor currents, the differential form of the current relationship (?I_E = ?I_B + ?I_C) is used. This approach allows us to determine the required change in the base current for a given change in the collector current by subtracting the collector change from the emitter change.

Please give Ace some feedback