# Numericals based on meter bridge

For example, question is….

In a meter 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?

Solution: We have from meter bridge experiment

R1/ R2 = L1/L2 , where L2 = (100 – L1) cm

In the first case, X/ Y = 20/80

In second case, 4X/ Y = l/ 100-l

Solving further, you will get l= 50 cm.