A resistance of is connected across one gap of a metre bridge of wire length

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

Problem

A resistance of

2\ \Omega

is connected across one gap of a metre bridge of wire length

100\ \text{cm}

, and an unknown resistance greater than

2\ \Omega

is connected across the other gap. When the resistances are interchanged, the balance point shifts by

20\ \text{cm}

. Neglecting corrections, the unknown resistance is (1)

3\ \Omega

(2)

4\ \Omega

(3)

5\ \Omega

(4)

6\ \Omega