Question

What resistance R3 in parallel with resistances R1=10K Ω and R2=20K Ω gives an

equivalent resistance of Req=50 Ω

Answer 1

Step-by-step explanation:

R1 and R2 are in series =R1+R2=10K+20K=30KΩ

Req=50Ω

R3 is parallel with R1 and R2=>

(1/30k)+(1/r)=(1/Req)

r=50.0834Ω