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In a potentiometer arrangement a cell of...

In a potentiometer arrangement a cell of emf 1.5 V gives a balance point at 30 cm length of wire. Now, when the cell is replaced by another celle , the balance point shifts to 50 cm. What is the emf of second cell ?

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`r= ((l_(1) - l_(2))/(l_(2)))R = ( 60 cm - 50 cm )/(50 cm xx 10 Omega = 2Omega`
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