An N P N transistor is used in common emitter configuration as an amplifier with 1 k Ω load resistance. Signal voltage of 10 m V is applied across the base-emitter. This produces a 3 m A change in the collector current and 15 μ A change in the base current of the amplifier. The input resistance and voltage gain are:

Step-by-step solution

l o a d   r e s i s t a c e = o u t p u t   r e s i s t a c e R L = 1   k Ω = 1000   Ω   i n p u t   v o l t a g e = Δ V i = 10   m V = 10 × 10 - 3   V i n p u t   c u r r e n t = b a s e   c u r r e n t = Δ i B = 15   μ A = 15 × 10 - 6   A o u t p u t   c u r r e n t = c o l l e c t o r   c u r r e n t = Δ i C = 3   m A = 3 × 10 - 3   A Δ i B R i = Δ V i = 0.67   k &#