What are the maximum and minimum values of unknown resistance `X`, which can be determined using the post office box shown in the fig.3.34?

Explanation

`X=(QR)/P`
`X_(max)=(Q_(max)R_(max))/P_(min)`
`=1000/10(11110)`
`=1111kOmega`
`X_(min)=(Q_(min)R_(min))/(P_(max)`
=`((10)(1))/1000`
`=0.01Omega`