Two resistances are connected in the two gaps of a meter bridge

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

Two resistances are connected in the two gaps of a meter bridge. The balance point is

20\,\text{cm}

from the zero end. When a resistance of

15\,\Omega

is connected in series with the smaller resistance, the null point shifts to

40\,\text{cm}

. The smaller resistance has the value (1)

8\,\Omega

(2)

9\,\Omega

(3)

10\,\Omega

(4)

12\,\Omega