Question 1 What is a solenoid?
Question 2 Draw the pattern of field lines due to a solenoid carrying electric current?
Magnetic field due to a current in a solenoid
A solenoid is a coil of many turns of an insulated copper wire closely wound in the shape of a tight spring.
When an electric current flow through a solenoid,magnetic field is set up around solenoid similar to that of a bar magnet.
One end of a solenoid act as a north pole and other as south pole.
Magnetic field is represented by straight magnetic field lines parallel and very close to each other.
Magnetic field inside a long solenoid decreases as we move towards ends of solenoid because magnetic field lines near the ends of solenoid start spreading out.