Question

please answer this question

Answer 1

Maximum value is obtained in series combination.

R = R1 + R2

R = 9.

R1 + R2 = 9.

R2 = 9 - R1


Least value can be obtained in parallel combination.

1/R = 1/R1 + 1/R2

R = (R1 * R2) / R1 + R2

2 = (R1 * R2) / 9

R1 * R2 = 18

Substituting value of R2

R1(9 - R1) = 18

R1² - 9R1 + 18 = 0

(R1 - 6)(R1 - 3) = 0

R1 = 3,6

Then

R2 = 6,3.


Thank you.