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The figure shown gives values of R(1 )an...

The figure shown gives values of `R_(1 )`and `R_(2), the balance point for jockey is at 30 cm from A. When `R_(2)` is shunted by a resistance of `10 Omega, ` jockey has to slide 20 cm to obtain balance point. The values of `R_(1)` and `R_(2)` are

A

`10/5 Omega, 5 Omega`

B

`40/3 Omega, 40/7 Omega`

C

`40/7 Omega, 40/3 Omega`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
c. `R_1/R_2 = 30/70 = 3/7`………..(i)
`R_1/R'_2 = 50/60 = 1 or R_1 = R'_2` ……………(ii)
`R_1 = (R_2xx 10)/(R_2+10) = 3/7R_2 or R_2 = 40/3 Omega or R_1 = 40/7 Omega` .
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