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For RN space-time, it is shown that the ratio is $\\frac{\\lambda_{p}}{\\lambda_{c}}=\\frac{r_{0}}{\\sqrt{r_{0}^2-3Mr_{0}+2Q^2}}$ for time-like circular geodesics and for Schwarzschild BH it is $\\frac{\\lambda_{p}}{\\lambda_{c}}=\\frac{\\sqrt{r_{0}}}{\\sqrt{r_{0}-3M}}$. We further show that their ratio $\\frac{\\lambda_{p}}{\\lambda_{c}}$ may vary from orbit to orbit. 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We also compute their ratio. For RN space-time, it is shown that the ratio is $\\frac{\\lambda_{p}}{\\lambda_{c}}=\\frac{r_{0}}{\\sqrt{r_{0}^2-3Mr_{0}+2Q^2}}$ for time-like circular geodesics and for Schwarzschild BH it is $\\frac{\\lambda_{p}}{\\lambda_{c}}=\\frac{\\sqrt{r_{0}}}{\\sqrt{r_{0}-3M}}$. We further show that their ratio $\\frac{\\lambda_{p}}{\\lambda_{c}}$ may vary from orbit to orbit. 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