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

In a meter bridge, null point is at `l=33.cm`. When the resistance `S` is shunged by `12Omega` resistance the null point is found to be shifted by a distance of `18.2cm`. The value of unknown resistance `R` should be

A

`13.5Omega`

B

`68.8Omega`

C

`3.42Omega`

D

None of these

Text Solution

Verified by Experts

`(R)/(S) = (33.7)/(100 - 33.7) rArr (R)/(((12xxS)/(12+S)))=((33.7+18.2))/(100-(33.7+18.2))`
solving get `R = 6.86Omega` .
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