Question

​How​ ​much​ ​work needs​ ​to​ ​be​ ​done​ ​in​ ​moving​ ​3​ ​C​ ​of​ ​charge​ ​from​ ​point​ ​A​ ​to​ ​B​ ​if the​ ​potential​ ​difference​ ​between​ ​these​ ​points​ ​is​ ​12​ ​V?

Answer 1

If a charge Q is moved from a point with electrostatic potential V(A) to another point with electrostatic potential V(B) then the work done W is given by W= Q* (V(B) - V(A) ).

So in your case the work done W= 3*12 =36J