1.

A potentiometer wire of length 5m is connected to a battery for a certain cell having negligible resistance the null point is obtained at 250cm if length of potentiometer wire is increased by 1m where will be the new position of the null point?

Answer»

null point will be obtained at 300 cm.Explanation : The initial length of POTENTIOMETER wire = 5 mFinal length of potentiometer wire = 5+1 = 6 mInitial BALANCE point = 250 cm = 2.5 MWE know that in a potentiometer the balance point is directly proportional to the length of the wire,=> N/2.5 = 6/5=> N = 6/5 x 2.5 = 3 m = 300 cmHence the new null point will be obtained at 300 cm.



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