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 n−p−n 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 n−p−n 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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