MCQ
ln a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when:
$[1]$ battery emf is increased
$[2]$ all resistances are increased by $10\,ohms$
$[3]$ all resistances are made five times
$[4]$ the battery and the galvanometer are interchanged
- Aonly $[1]$ is correct
- B$[1], [2]$ and $[3]$ are correct
- ✓$[1], [3]$ and $[4]$ are correct
- D$[1]$ and $[3]$ are correct