Explain(physically) why curl of an electric field is zero but that of magnetic field is not zero.
i know that former is conservative and all. i just want to ask what is the physical significance of curl?

You can consider it the degree to which the electric field lines flow around each of the three organize tomahawks: this is the general elucidation of twist. For an electric field created by stationary charges, the field lines point radially, with no flow. Surely, for any twist free electric field, you can decide the appropriation of charges by taking the dissimilarity. In the event that you have an electric field with twist, you know it's produced in some other way.

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.