DIFFERENCE BETWEEN POTENTIAL DIFFERENCE AND EMF

Write two differences between potential difference and EMF.

Establish a relation between E.M.F. and potential difference of a cell.

A combination of capacitors given is charged by a cell of emf E as shown : If it is given that V_(ab) i.e. potential difference between points a and b is 4V, then answer the given questions. Potential difference between points a and c will be: