[" Electric field (E) and current "],[" density (J) have relation "]

The expression for Ohm's law in terms of electric field E and current density J is:-

The electric field intensity E, current density J and conductivity delta are related as—

The electric field E, current density j and conductivity sigma of a conductor are related as

When current flows through copper wire, current density J, electric field E and motion of electrons have directions such that