Question

A charge q moves in a region where electric field E and magnetic field B both exist then force on it is

Answer 1

You must have read the Faraday's law of electromagnetic induction. It comprises of three laws out of reach the third law was the Definition of Lorentz Force. Over here when both electric field and magnetic field are acting on the particle then the total resulting force will be equal to the expression of Lorentz Force that is : 
given by F = qE + qv × B