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In the meter bridge experimental set up,...

In the meter bridge experimental set up, shown in the figure, the null point 'D' is obtained at a distance of 40 cm from end A of the meter bridge wire. If a resistance of `10 Omega` is connected in series with `R_(1),` null point is obtained at `AD = 60 cm. ` Calculate the values of `R_(1) and R_(2).`

A

`20Omega`

B

`30Omega`

C

`40 Omega`

D

`60 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
`(R_(1))/(R _(2))= (40)/(100-40)`
or ` (R_(1))/(R _(2)) =2/3" "...(i)`
`(R_(1) +10)/(R _(2)) = (50)/(100-50)`
or ` (R_(1)+ 10)/(R_(2))=1" "...(ii)`
From (i) and (ii)
`R_(1) =20 Omega , R_92) =30Omega`
also `1/X+ (1)/(R _(1) +10)= (1)/(R _(1))or X =60 Omega`
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