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An unknown resistance is placed in the l...

An unknown resistance is placed in the left gap and resistance of 50 ohm is placed in the right gap of a meter bridge . The null point is obtained at 40 cm from the left end. Determine the unknown resistance.

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Given `R=50` ohm
`l_(x)=40cm` from left
We know that, `X=R((l_(x))/(100-l_(x)))`
Unknown resistance `(X)=50((40)/(100-40))`
`=(50xx40)/(60)=33.33` ohm.
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