Question

If we use `100 Omega` and `200 Omega` in place of `R` and `X` we get null point deflection, `l = 33cm`. If we interchange the resistors, the null point length is found to be `67 cm` Find end corrections `prop and beta`.
A. `alpha=1cm`, `beta=1cm`
B. `alpha=2cm`, `beta=1cm`
C. `alpha=1cm`, `beta=2cm`
D. None of these

Answer 1

Correct Answer - A
`alpha=(R_(2)l_(1)-R_(1)l_(2))/(R_(1)-R_(2))`
`=((200)(33)-(100)(67))/(100-200)=1cm`
`beta=(R_(1)l_(1)-R_(2)l_(2))/(R_(1)-R_(2))-100`
`=((100)-(200)(67))/(100-200)-100=1cm`