Question

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

     

Options

• 55 Ω

• 1375 Ω

• 220 Ω

• 110 Ω

Answer 1

Shown in the figure below is a metre bridge set up with null deflection in the galvanometer. The value of the unknown resistance R is 220 Ω.

Explanation:

For balanced Wheatstone bridge,

`55/"R" = 20/80` ⇒ R = 220 Ω.