Question

B. When two resistors are connected
in series, their effective resistance
is 80 S2. When they are connected
in parallel, their effective resistance
is 20 S2. What are the values of the
two resistances?.​

Answer 1

Answer:

Yes definitely both resistance must be same 40 ohm's.

In series equivalent resistance is R1+R2=80 ohm's.

In parallel equivalent resistance is

(R1.R2)/(R1+R2)=20 ohm's.

So R1.R2=1600 ohm's.

By solving underlined eq by using formula of quarditic equation

(R1+R2)^2-(R1-R2)^2=4R1.R2

So we get finally R1=R2=40 ohm's.