sir i am in trouble that after entering in ground how electron reach to its main source as ground is different at different place and hoe we can judge that at a particular point it is conductor or insulator inside the ground?

 

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I'm not sure I complete understand your question, but a ground potential is only different due to any current going through the ground impedance between any two ground points. Normally you attempt to keep all points on a ground at the same potential by keeping this impedance as low as possible, such as by using a solid copper ground plane on a circuit board, which minimizes both inductance and resistance.

I don't know what you mean by insulator inside the ground. Of course a ground is insulated from the signal and power lines in a circuit, if that's what you are referring to.