Moreover, why force is negative gradient of potential?
Because the gradient of any field (like the gravitational potential field) points in the direction of largest increase in that field. The force will point in the direction of the largest decrease in potential (energy) — in the negative of the gradient of the potential field.
Beside above, what do you mean by potential gradient? In physics, chemistry and biology, a potential gradient is the local rate of change of the potential with respect to displacement, i.e. spatial derivative, or gradient. This quantity frequently occurs in equations of physical processes because it leads to some form of flux.
Likewise, people ask, what is a negative potential?
: an electric potential lower than that of the earth or other conductor taken as an arbitrary zero of potential.
Why is there a negative sign in electric potential?
Electric potential at a point is the work done to introduce a charge at that point from infinity. By convention, we say, that the charge and the field causing the potential did work against their natural inclinations thus the work done by them is negative.
