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

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 decide to balance a resistance of 4X against Y -

Options

G1 Physics · Accepted Answer

Initially X/Y=20/80=1/4. Replacing X by 4X makes the ratio 1, so the balance point must be at equal lengths 50 cm and 50 cm. Correct answer: A.