Two identically charged pith balls are suspended from the some point by two massless identical threads density of each ball is $\rho $. If system is immersed in a medium of density $\sigma $, balls remain undeflected, then the dielectric constant of medium is
Two identically charged pith balls are suspended from the some point by two massless identical threads density of each ball is $\rho $. If system is immersed in a medium of density $\sigma $, balls remain undeflected, then the dielectric constant of medium is
- A
$\frac{\rho }{{\rho - \sigma }}$
- B
$\frac{ \rho - \sigma }{{\rho }}$
- C
$\frac{\sigma }{{\rho - \sigma }}$
- D
$\frac{ \rho - \sigma }{{\sigma }}$
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