In a Wheatstone bridge, all four arms have equal resistance R. If galvanometer arm resistance also R, equivalent resistance seen by battery is:
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In a Wheatstone bridge, all four arms have equal resistance R. If galvanometer arm resistance also R, equivalent resistance seen by battery is:

G1 Physics · Accepted Answer

Step 1: The symmetrical bridge is balanced; no current flows through galvanometer arm. Step 2: Two branches each have total resistance R+R=2R. Step 3: Their parallel equivalent is (2R||2R) = R.