in a meter bridge when the resistance in the left gap is 2ohm an unknown resistance in the - Physics - Current Electricity

Question

in a meter bridge when the resistance in the left gap is 2ohm
& an unknown resistance in the right gap, the balance point is
obtained at 40cm from zero end on shunting the unknown resistance
with 2ohm, find the shifty of the balance point on the bridge
wire

Loveleen Nagpal · Answer

in first case :- 2/r = 40/60
r =3 ohm
on shunting the resistance in the right gap = 3*2 / 3+2 = 6/5 [
as both r in parallel]
now the balance point shifts as
2 / (6/5) = x / (100-x)
x = 62 5 cm

in a meter bridge when the resistance in the left gap is 2ohm & an unknown resistance in the right gap, the balance point is obtained at 40cm from zero end. on shunting the unknown resistance with 2ohm, find the shifty of the balance point on the bridge wire.