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KCET2018PhysicsSemiconductors

The dc common emitter current gain of a n-p-n transistor is 50, The potential difference applied across the collector and emitter of a transistor used in ( C E ) configuration is ( V_ C E =2 V ). If the collector resistance, ( R_ C =4 ~K ), the base current ( (I_ B ) ) and the collector current ( (I_ C ) ) are

Options

  1. A( I_ B =10 A , I_ C =0.5 ~mA )
  2. B( I_ B =0.5 A , I_ C =10 ~mA )
  3. C( I_ B =5 A , I_ C =1 ~mA )
  4. D( I_ B =1 A , I_ C =0.5 ~mA )

Correct answer

A. ( I_ B =10 A , I_ C =0.5 ~mA )

Step-by-step solution

Given, current gain, [ array l =50 ; V_ C E =2 V ; R_ C =4 k I_ C = V_ C E R_ C = 2 4 10³ =0.5 10⁻³ A I_ C =0.5 ~mA array ] [ array l Also, 85 = I_ C I_ B I_ B = I_ C = 0.5 10⁻³ 50 =10⁻⁵ ~A I_ B =10 A array ]

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