In a metre-bridge experiment

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

Problem

In a metre-bridge experiment, the null point is obtained at

20\text{ cm}

from one end of the wire when resistance

x

is balanced against resistance

y

. If

x<y

, the new position of the null point from the same end, when

4x

is balanced against

y

, will be at: (1)

50\text{ cm}

(2)

80\text{ cm}

(3)

40\text{ cm}

(4)

70\text{ cm}