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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 < 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 ?

A

50 cm

B

80cm

C

40 cm

D

70cm

Text Solution

Verified by Experts

The correct Answer is:
A
We have `(R_(1))/(R_(2))=(l_(1))/(l_(2))` where `l_(2)=(100-l_(1))` cm
In the first case, `X/Y=20/80`
In the second case, `(4X)/Y=l/(100-l)`
`rArrl=50cm`
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