Question

Shown in the figure below is a meter bridge set up with null deflection in

the galvanometer. The value of the unknown resistor R is

(a) 13.75 Ω (b) 220 Ω (c) 110 Ω (d) 55 Ω
(figure in the photo)​

Answer 1

Answer:

Balance condition for a meter bridge :

R

S

=

100−l

l

here,

R

55

=

100−20

20

=1/4

∴R=55×4=220Ω