In a metre bridge experiment null point is obtained at 40 cm from one end of the wire when resistance X is balanced against another resistance Y . If X

Question

In a metre bridge experiment null point is obtained at 40 cm from one end of the wire when resistance X is balanced against another resistance Y . If X < Y , then the new position of the null point from the same end, if one decides to balance a resistance of 3 X against Y , will be close to :

TestHub · Accepted Answer

From question, y x ​ = 100 − 40 40 ​ = 3 2 ​ ⇒ x = 3 2 ​ y Again, y 3 x ​ = 100 − Z Z ​ or y 3 × 3 2 y ​ ​ = 100 − Z Z ​ Solving we get Z = 67 cm Therefore new position of null point ≅ 67 cm

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion