CBSE Class 12 Physics 2018 Delhi Set 1 Paper

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Question : 21
Total: 26
Draw the typical input and output characteristics of an npn transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance (η) , and (b) current amplification factor (β) .
Solution:  
Input and Output characteristics
Determination of
(a) Input resistance
(b) Current amplification factor
The input and output characteristics, of npn transistor, in its CE configuration, are as shown.

(a) Typical input characteristics Input resistance
ri=(
VBE
IB
)
VCE


(b) Typical output characteristics
The relevant values can be read from the input characteristics.
(b) Current amplification factor
β=(
IC
IB
)

The relevant values can be read from the output characteristics, corresponding to a given value of VCE.
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