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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

`55 Omega`

B

`110 Omega`

C

`220 Omega`

D

`13.75 Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
For a Wheatstone's bridge
`(55)/(R )=(20)/(80) therefore R= (55xx80)/(20)=220 Omega`
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