. What is a solenoid. Describe it briefly
Ans: The solenoid is a long coil containing a large number of close turns of insulated copper wire. When an electric current is passed through the solenoid, it produces a magnetic field around it. The magnetic field produced by a current carrying solenoid is shown in the figure. The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet. The lines of magnetic field pass through the solenoid and return to the other end as shown in Figure. The magnetic field lines inside the solenoid are in the form of parallel straight lines.
This indicates that the strength of magnetic field is the same at all the points inside the solenoid.