1.

Shown in the figure below is a meter- bridge set up will null deflection in the galvanometer. The value of the unknown resistor R isA. `110 Omega`B. `55 Omega`C. `13. 75 Omega`D. `220 Omega`

Answer» Correct Answer - D
d. For balanced meter bridge (null deflection), we get
`(55)/R = 20/80 or R = 220 Omega` .


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