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In the meter bridge circuit shown i...

In the meter bridge circuit shown in figure . Find the length AB for null deflection in galvaometer .

Text Solution

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Let AB = I cm then BC = (100 - l)cm
At zero deflection of Galvanomter ,
`(R_(1))/(R_(2)) = (R_(AB))/(R_(BC)) = (l)/(100-l)`
` rArr (15)/(10) = (l)/(100-l) " " rArr (3)/(2) = (l)/(100-l) " " rArr 300 - 3l = 2l`
`rArr 5l = 300 " " rArr l = 60 cm`
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