Question

corect ans as brain list

Answer 1

Answer:

C) 15Ω is correct option

For a balanced wheatstone network,

$\frac{R1}{R2}=\frac{R3}{R4}$

Here,

$\frac{5}{10}=\frac{R'}{20}$

$R'=10$

Since the two resistors are connected in parallel,

$\frac{1}{R'}=\frac{1}{30}+\frac{1}{X}$

$\frac{1}{10}-\frac{1}{30}=\frac{1}{X}$

$\boxed{\boxed{X=15}}$

Hope this answer helped you :)

Answer 2

Answer:

Option C

Explanation: