All the resistance in the given Wheatstone bridge have different values and the current through ...

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All the resistance in the given Wheatstone bridge have different values and the current through the galvanometer is zero. The current through the galvanometer will still be zero if,
(1) the emf of the battery is doubled
(2) all resistances are doubled
(3) resistances \( R_{1} \) and \( R_{2} \) are interchanged
(4) the battery and the galvanometer are interchanged
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