Current Electricity and Electrical InstrumentHard
Question
In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y?
Options
A.50 cm
B.80 cm
C.40 cm
D.70 cm
Solution
We have from meter bridge experiment,
where l2 = (100 - l1) cm
In the first case, X/Y = 20/80
In the second case
l = 50 cm.
where l2 = (100 - l1) cm In the first case, X/Y = 20/80
In the second case
l = 50 cm.
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