Question

If R1,R2 be two resistances find R₁, R₂ when their series combination is 30 ohm & Parallel combination is 20 ohm​

Answer 1

Answer:

Step 1: Calculation of equivalent resistance

                 Req1=R11+R21

                           =1001+2001

             ⇒Req=3200=66.7Ω

Step 2: Error in equivalent resistance

                  Req1=R11+R21

                  ⇒Req−1=R1−1+R2−1

Differentiating on both the sides:

                   Req2−dR=R12−dR1+