Length of potentiometer wire is 5 m. It is connected with a battery of fixed e.m.f Null point is obtained for Daniel cell at 100 cm on it. If the length of the wire is made 7 m, then what will be the position of null point?

Length of potentiometer wire is 5 m. It is connected with a battery of

1.	Length of potentiometer wire is 5 m. It is connected with a battery of fixed e.m.f Null point is obtained for Daniel cell at 100 cm on it. If the length of the wire is made 7 m, then what will be the position of null point?
Answer» Solution :Let the e.m.f of battery be E volt, the potential gradient is `K_1 = E/5 V//m` When the length of poteniometer wire is 7 m potential gradient is `k_2 = E/7 V//m` Now, if NULL point is obtained at length `l_2` , then `E_2 1= k_2 l_2 = E/7 l_2 V` Here same CELL is balanced in two ARRANGEMENTS , HENCE `E/5 l_1 = E/7 l_2""l_1 = 1 m` `""l_2 = 7//5 = 1.4 m`

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Length of potentiometer wire is 5 m. It is connected with a battery of fixed e.m.f Null point is obtained for Daniel cell at 100 cm on it. If the length of the wire is made 7 m, then what will be the position of null point?

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