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

Text Solution

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The correct Answer is:
A, B
`X=(QR)/p`
`:. X _(max)=(Q_(max) R_(max))/(P_(min))`
`=(1000)/(10)(11110)`
=`1111 kOmega`
`X _(min)=(Q_(min)R_min)/(P_(max))`
=`((10)(1))/(1000)`
=`0.01 Omega`.
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