In a potentiometer, a standard cell of emf 5V of negligible internal resistance maintains a steady current through Potentiometer wire of length 5m. Two primary cells of emf E_1 and E_2arejoinedin serieswith(i)same polarity (ii) opposite polarity. The balancing point are found at length 350 cm and 50 cm in two cases respectively.(i) Draw necessarycircuitdiagram. (ii)Findthevalue ofemfE_1and E_2ofthetwo cells(ifE_1gt E_2)

In a potentiometer, a standard cell of emf 5V of negligible internal r

1.	In a potentiometer, a standard cell of emf 5V of negligible internal resistance maintains a steady current through Potentiometer wire of length 5m. Two primary cells of emf E_1 and E_2arejoinedin serieswith(i)same polarity (ii) opposite polarity. The balancing point are found at length 350 cm and 50 cm in two cases respectively.(i) Draw necessarycircuitdiagram. (ii)Findthevalue ofemfE_1and E_2ofthetwo cells(ifE_1gt E_2)
Answer» Solution :Pot. GRADIENT `k=(5)/(3)= 1 VM ^(-1) ` `L _1 = 350cm=3.5 m ` `E_1 + E_2=kl_1=3.5 "" `…(1) ` E_1- E_2 =0.5"" `…(2) ` E_1=2V, E_2 = 1.5 ` VOLT

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