In given circuit current through $AB$ is zero, then what will be the value of unknown resistance $'X'$ ............... $\Omega$
A$10$
B$5$
C$40$
D$15$
Medium
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C$40$
c From wheat stone bridge balance condition,
${\frac{10}{5}=\frac{x}{20}} $
${x=40\, \Omega}$
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