Question

find the value of X anf current flowing through it​

Answer 1

Explanation:

the valye of x is nothing but 0

Answer 2

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Let them be in series then,

$resistence(a) = (10 + x)ohm$

$resistence(b) = (25 + 75) = 100ohm$

Now they are in parallel so,

$total \: resistence = \frac{1}{a} + \frac{1}{b}$

$given \: total \: resistence = 20ohm$

so,replacing the values we get,

$20 = \frac{1}{10 + x} + \frac{1}{100}$

$\implies20 = \frac{100 + 10 + x}{100(10 + x)}$

$\implies20(1000 + 10x) = 110 + x$

$\implies20000 + 200x = 110 + x$

$\implies19890 + 199x = 0$

$\implies \: x = 100ohm(approx)$