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Shown in the figure below is a meter- br...

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

A

`110Omega`

B

`55Omega`

C

`13.75Omega`

D

`220Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
For a balanced meter bridge (null deflection).
`(55)/(R )=(20)/(80)`
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