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In a meter bridge experiment null point ...

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`lt`Y, then where will be the new position of the null point from the same end, if one deicdes to balance a resistance of 4 X against Y

A

50 cm

B

80 cm

C

40 cm

D

70 cm

Text Solution

Verified by Experts

The correct Answer is:
A
`X/Y = 20/(100-20) = 1/4`
`(4X)/Y = l/(100-l) rArr 1 = l/(100-l)`
`rArr 100 - l = 1 rArr l = 50 cm`
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