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Questions  

NPN transistor are preferred over PNP transistor because they have

a
Low cost
b
Low dissipation energy
c
Capability of handling large power
d
Electrons having high mobility than holes

detailed solution

Correct option is D

Electrons are majority charge carriers in NPN transistors ,  which have high mobility than  holes and thus produce large current.

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In the circuit shown, the base current is 30 µA. The value of R1 is (Neglect VBE)


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