In a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when: 1. ...

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In a balanced wheat stone bridge, current in the galvanometer is zero. It remains zero when:
1. battery emf is increased
2. all resistance are increased by \( 10 \mathrm{ohms} \)
3. all resistance are made five time
4. the battery and the galvanometer are interchanged
(a) Only 1 is correct
(b) 1,2 and 3 are correct
(c) 1,3 and 4 are correct
(d) 1 and 3 are correct
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