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Shown in the figure below is a meter- bridge set up will null deflection in the galvanometer. The value of the unknown resistor R is

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Shown in the figure below is a meter- bridge set up will null deflection in the galvanometer.
image
The value of the unknown resistor R is
A. `110Omega`
B. `55Omega`
C. `13.75Omega`
D. `220Omega`
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Correct Answer - D
For a balanced meter bridge (null deflection).
`(55)/(R )=(20)/(80)`
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