3.8.6　Analysis and questions

(1)According to the distribution of equipotential line and electric field line,can we know where the electric field is stronger and where the electric field is weaker?

(2)How to determine the center of the round of equipotential line cluster when describing the equipotential line cluster of coaxial cable?How to draw a circular equipotential line?(https://www.daowen.com)

(3)Summarize the distribution characteristics of the electrostatic field in a coaxial cylindrical cable according to the equipotential line.

(4)If the voltage of power supply is doubled,will the shape of the equipotential line and electric field line change?Will the electric field intensity and potential distribution change?Why?