Question

What makes the electric charge to flow?

Answer 1

Q-1=What makes the electric charge to flow
Answer=voltage gradient around the circuit  makes the electric charge to flow

Answer 2

When we bring a positively charged body toward a negatively charged body, the negatively charged particles in the negatively charged body move towards the positively charged particles in the other body, i.e, an electric charge moves when we bring two differently charged body or the same charges(but they will reple each other).