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NEET 2003 (AIPMT) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from NEET 2003 (AIPMT)

Q85NEET 2003 · AIPMTEasy

Wheatstone Bridge & Metre Bridge

In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is

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Answer: (c)

All four arms equal, so the bridge is balanced and no current flows in the galvanometer arm.
Remove that arm: two branches of $2R$ each in parallel.
$R_{eq} = \frac{2R \cdot 2R}{4R} = R$
So the answer is (c) R.

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