Question

If we use `10 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 `alpha` and `beta`.

Answer 1

`alpha=(R_2l_1-R_1l_2)/(R_1-R_2)`
`=((200)(33)-(100)(67))/(100-200)`
`=1cm`
`beta=(R_1l_1-R_2l_2)/(R_1-R_2)`
`=((100)(33)-(200)(67))/(100-200)-100`
`=1cm`