Question

In a Wheatstone bridge all the four arms have
equal resistance R. If the resistance of galvanometer
arm is also R, the equivalent resistance
of combination as seen by battery is
(a) 2R (b) R/4
(c) R/ (d) R

Answer 1

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(d) R

If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is R. Explanation: In balanced condition of Wheatstone's bridge there will be no current flowing through the arms BD. Hence the equivalent resistance of the combination is seen by the battery is R