Question

3. In the circuit shown below calculate the value of x if the equivalent resistance between
A and B is 4 ​

Answer 1

Resistance in the upper arm= 10+15=25ΩResistance in the lower arm =20+5 =25ΩEffective resistance1R=1R1+1R21R=125+125R=252=12.5Ω

rong answer!!

Answer 2

Answer:

r1 = 4 ohm

r2 = 8 ohm

r3 = x ohm

r4 = 5 ohm

r = 4 ohm

and then half is in the attached pic.

hope it helps.....