wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

In an NPN power transistor, the emitter current is 20mA. If 98% of the electrons injected in to the base region reach the collector, the base current is nearly


A

2mA

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

1mA

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

0.6mA

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

0.4mA

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D

0.4mA


Step 1: Given data

It is given that emitter current,

IE=20mA

98% of the electrons injected in to the base region reach the collector,

Step 2: To find

The base current,IB

Step 3: Calculation

Since 98% of the electrons reach the collector, the collector current is 98% of the emitter current and the base current is 2% of the emitter current

As the collector current is nearly equal to the emitter current, the base current is 2% of the collector current.

Base current,

IB=2%ofIEIB=2100×20IB=0.4mA

The base current is 0.4mA.

Option D is correct.


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Transistor
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon