Question

The nature of magnetic field inside a constant current carrying long and thin solenoid is?

Answer 1

A solenoid consists of an insulated wire coiled in the form of a cylinder. One end of the solenoid acts as a north pole whereas the other end acts as a south pole. When current passes through it, magnetic field is produced both inside and outside the solenoid. However, the strength of the magnetic field is stronger inside the solenoid as compared to outside. The field lines inside the solenoid are parallel straight lines which indicate that the magnetic field is uniform inside the solenoid. 
The direction of the magnetic field depends upon the direction of the current. Reversing the direction of the current reverses the direction of the magnetic field.
The strength of the magnetic field can be increased by:
1. Increasing the current in the solenoid.
2. Increasing the number of loops of the wire around the cylinder.
3. Using a soft iron core inside the solenoid.

Answer 2

1. A solenoid is made up of an insulated wire that has been coiled into the shape of a cylinder.
2. One end of the solenoid serves as the north pole, while the other serves as the south pole.
3. When current flows through it, it generates a magnetic field both inside and outside the solenoid.
4. However, the magnetic field strength is greater inside the solenoid than outside.
5. The magnetic field inside a long straight solenoid-carrying current is the same or uniform at all points.
6. Because the lines are completely parallel to each other, the magnetic field in the solenoid is constant.

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