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Question

In a metre bridge experiment, null point is obtained at 20cm from one end of the wire when resistance X is balanced against another resistance Y. If X<Y, then the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y will be at :

A
50cm
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B
80cm
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C
40cm
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D
70cm
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Solution

The correct option is A 50cm
When X balanced against Y : XY=2010020 or

Y=4X

Let l be the required balanced condition

so when 4X balanced against Y: 4XY=l100l or

4X4X=l100l

or 100l=l

or l=50cm

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