In a CE transistor when the base current increases by 60 A , change in base-emitter voltage is 1.2 ~V . Then the input resistance is

Step-by-step solution

aligned & I _ b =60 A =60 10⁻⁶ ~A & V_ BE =1.2 ~V & ~V _ BE = I _ b R _ in & R _ in = V _ BE I _ b = 1.2 60 10⁻⁶ =20000 aligned