A) \[4\,\Omega \]
B) \[3\,\Omega \]
C) \[2\,\Omega \]
D) \[1\,\Omega \]
Correct Answer: C
Solution :
It is a balanced Wheatstone's bridge. The equivalent circuit is shown in the figure. The diagonal resistance, which is the galvanometer arm in Wheatstone's bridge becomes ineffective, when the bridge is balanced. \[{{R}_{PCQ}}=2+2=4\,\Omega \] \[{{R}_{PDQ}}=2+2=4\,\Omega \] APCQB and APDQB are in parallel. \[{{R}_{AB}}=\frac{4\times 4}{4+4}=2\Omega \]You need to login to perform this action.
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