A) \[10\,\Omega \]
B) \[20\,\Omega \]
C) \[25\,\Omega \]
D) \[30\,\Omega \]
Correct Answer: A
Solution :
In arm ABC, resultant resistance \[R'={{R}_{1}}+{{R}_{2}}=10+10=20\Omega \] In arm ADC resultant resistance \[R'\,'={{R}_{3}}+{{R}_{4}}=10+10=20\Omega \] Resistances \[R'\] and \[R'\,'\] are in parallel, \[\therefore \] \[\frac{1}{R}=\frac{1}{R'}+\frac{1}{R'\,'}=\frac{1}{20}+\frac{1}{20}\] \[R=10\Omega \]
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