Is Magnetic field at one end of an infinite solenoid along the axis? If a is the area of cross section of solenoid with I current and n turns per unit length.then
What is a solenoid? Draw the pattern of magnetic field lines of (i) A current carrying solenoid and (ii)A bar magnet. List two distinguishing features between the two fields.
![electromagnetism - What are the limits of validity for the magnetic field of a solenoid? - Physics Stack Exchange electromagnetism - What are the limits of validity for the magnetic field of a solenoid? - Physics Stack Exchange](https://i.stack.imgur.com/IHvMQ.png)