I've added a 5k pot between R1&R2, but It's not correcting the problem.
Then I made the circuit in bread board with all new components. Rsc is connected with a psu (V1, variable) and Tl082 is connected to another psu(V2) of 12v (Both grounds connected together). The circuit has been tested both with load (a motor which draws around 100ma at around 9V) and without load at V1 output.
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I measured output of Tl082 at pin 1 and pin 7. both pins outputs near V2 (near 12v).
I tested adding a pot(10k) first between R1& R2, then between R3 & R4. In all three cases the outputs are almost same, it doesn't change with the change in pot's value.
It seems that 'no matter what the outputs shall remain close to V2'.
I don't have much experience with Op-amp. I need a solution, please.