Irodov

danilo_rj

I've got a problem from Irodov.
There are two stationary fields of force F=ayi and F = axi + byj, where i and j are unit vectors of the x and y axes, and a and b are constants. Find out whether these fields are potential.
But how do I know that a field is potential? I've read that I have to calculate the work performed by these forces and if the work depends on the path or not. But why of this?

danilo_rj

nobody knows...

danilo_rj

what does this red card mean?

Invariant

I think Checking whether the curl of total fields is zero or not is the best way