Which of the following statement/s is/are correct of a source of emf (such as a primary cell) ?
A. Inside the cell there always exist and electrostatic field and a non-electrostatic field of equal magnitude directed opposite to it.
B. Potential difference is the work of an electrostatic field whereas electromotive is the work of a non-electrotatic field.
C. Under certain condition current can flow from positive terminal to negative terminal within the cell.
D. When and external resistance is connected to the cell, the electrostatic field inside the cell decreases in megnitude compared to the non-electrostatic field.
