Q .     Two resistances are connected in two gaps of a metre bridge. The balance point is `20` cm from
the zero end. A resistance of `15 Omega` is connected in series with the smaller of the two. The null
point shifts to `40` cm. The value of the smaller resistance in ohms is :

BITSAT 2005
A

`3`

B

`6`

C

`9`

D

`12`

HINT

Formula for metre bridge `S = ((100 - l)/l) R`

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