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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

`220 Omega`

B

`110 Omega`

C

`55 Omega`

D

`13.75 Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`(55)/(R) = (20)/(100 - 20)rArr (55)/(R) = (1)/(4)`
`R = 220 Omega`.
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