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Question: In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistanc...

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 4 X against Y?

A

50 cm

B

80 cm

C

40 cm

D

70 cm

Answer

50 cm

Explanation

Solution

∴ 

or 4(14)=R100−ℓ4 \left( \frac { 1 } { 4 } \right) = \frac { R } { 100 - \ell } ∴ l = 50 cm