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

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

A

`55Omega`

B

`13.75Omega`

C

`220Omega`

D

`110Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
Since the bridge is balanced
`therefore55/R=20/(100-20)rArrR=220Omega`
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