1.

In the adjacent circuit a resisttance R is used.Initially with 'wire AB' not in the circuit, the galavanometer shhows a deflection of d divisions. Now, the wire AB is conneted parallel to the galvanometer and the galvanometer shows a deflection defiction nearly d/2 divisions. Therefore

Answer»

R=G
`RltltG`
`RgtgtG`
`R=(SG)/(S+G)`

ANSWER :C


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