[SI-LIST] least inductance path(return current)

This is a very basic doubt:

SI Book says that return current follows the "least inductance path"

Now supposingly i have the following stack up

1) signal

2) power

3) signal

4) gnd

5) signal

If i have atrack on layer 1.

Supposingly the circuit loops gets completed with the gnd on layer 4.

What will the return current path ?

Suppose there are ByPass caps also b/w power(2) and gnd(4).

"Some books says the return current will first go to power and then through 
bypass

to gnd". Is it correct ?

Can you please tell me why this happens ?

Even if my circuit does not include power(2)

why would current flow through it? ( i know i am missing something, need help)..

Thanks for the explanation

 

Regards

Karan


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