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In a meter bridge, null point is at l=33...

In a meter bridge, null point is at `l=33.7cm`, when the resistance `S` is shunted by `12Omega` resitance the null point is found to be shifted by a distance of `18.2 cm`. The value of unknown resistance `R` should be

A

`13.5 Omega`

B

`68.8 Omega`

C

`3.42 Omega`

D

`1.42 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`(R )/(S)=(33.7)/(100-33.7)`
`(R )/(125//12+5)=((33.7-18.2))/(100-(33.7-18.2))`
solving get `R=68.8Omega`
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