What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate?

What is a solenoid? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.

Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles.

List three ways in which the magnetic field strength of a current-carrying solenoid can be increased?

What type of core should be put inside a current-carrying solenoid to make an electromagnet ?