In a metre bridge , the gaps are enclosed by resistances of `2omega` and `3Omega` . The value of shunt to be added to `3Omega` resister to shift the balancing point by 22.5cm is

Options

A. 1 `Omega`
B. 2 `Omega`
C. 2.5 `Omega`
D. 5 `Omega`

Answer

B

Explanation

To obtain the balance point in meter bridge
`(2(3+x))/(3x)=(62.5)/(37.5)`
(6+2x)37.5=`62.5xx3x`
225+75x=187.5x
187.5x-75x=225
112.5x=225
x=2