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1-) M=50, m=5, h=5 then Potential Energy = (50*5)/5 = 50

After increasing height

2-) M=50, m=5, h=10 then Potential Energy = (50*5)/10 = 25

Field strength decreases amount of h^2 so according to formulas potential energy decreases as h increases.

But that mustn't be true. But as I showed according to Potential energy and Field strength formulas, potential energy decreases as h increases. What is wrong here?