Question

in a meter bridve the null point is found at a distance of 33.7cm from A.if a resistance of 12ohm is connected in parallel with S.the null point occurs at 51.9cm. determinethe values of R and S.

class 12th​

Answer 1

Answer:

Explanation:

when the resistace of 12 ohm is not connected

R = S ( $\frac{l}{100 - l}$

R = S $\frac{33.7}{66.3}$  l= 44.7

   = S ($\frac{1}{2}$

if 12 ohm resistance is included in parallel with S

  then  1/s = 1/s + 1/12

             S= 12S/ (12+S)

R = S $\frac{51.9}{48.1}$ ≈ S (1.07) ≈ S = $\frac{12 S}{ 12+S}$

now we have

$\frac{1}{2}$ S = $\frac{12S}{12+S}$

S= 12ohm

R =$\frac{1}{2}$ * 12

  = 6 ohm hope its ryt...