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The length of a potentiometer wire is 1m...

The length of a potentiometer wire is 1m and its resistance is `4Omega` A current of 5 mA is flowing in it. An unknown source of emf is balanced on 40 cm length of this wire, then find the emf of the source.

Text Solution

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`x=Irho=I(R)/(L)=(5xx4)/(1)=20mV`
`E=1x=0 ,40xx20=8mV`
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