Question

difference between uniform non uniform magnetic field mlines

Answer 1

I'm not sure what you're asking, perhaps you could rephrase?

Answer 2

F = qvB

F = force applied on object
v = speed of object
B = magnetic field strength

If uniform (homogenous) then B stays constant. If not, that it's strength changes as you pass through it.
Think about the formula, rearrange it and see how the variables would change in respect to one another if one was to change.

Answer 3

If that's not enough, google Biot-Savart's law.