Solve the following problems given below:

Problem 1: What is the shape of the equipotential curves very close to a conducting circular disk?

Problem 2: What is the shape of the field lines between two parallel conductors?

Problem 3: How do the lines of electric field alter, if a conducting circular disk is placed between the two conductors of question 2?

Problem 4: How do the lines of electric field alter, if an insulating circular disk is placed between the two conductors of question 2?

Any help I can get on these problems is greatly appreciated! I'm not too familiar with these problems.