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For the following diagram the galvanomet...

For the following diagram the galvanometer shows zero deflection then what is the value of R?

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For balanced Wheatstone bridge
`((100)/(100R))/((100+R))=(200)/(40)rArr(100+R)/(R)=5`
`100+R= 5R rArrR=(100)/(4)=25Omega`
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