Question

difference between magnetic field lines around a bar magnet and solenoid​

Answer 1

The poles of the bar magnet are fixed whereas for a solenoid the poles can be altered. The strength of the magnetic field of a bar magnet is fixed ie, unaltered whereas the strength of the magnetic field of a solenoid depends on the electric current that is passed through it.

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Answer 2

Answer:

The poles of the bar magnet are fixed whereas for a solenoid the poles can be altered. The strength of the magnetic field of a bar magnet is fixed i.e, unaltered whereas the strength of the magnetic field of a solenoid depends on the electric current that is passed through it.

The field lines of a solenoid and bar magnet appear same in many ways.

Similarities:

1 )   In both the cases  the magnetic lines inside the body is strong and uniform.

2 )  In both the cases there exists stronger field at the poles compared to the middle parts.

3 )  In both cases magnetism is cause by flow of electric current in circular loops,

in bar magnet this occurs in the atomic scale.

Dissimilarities:

1 ) The people of the bar magnet do  not lie exactly on the end of the magnet but is somewhat inside.

In solenoid poles can be considered to be lying at the edge.

2 )  The magnetism retains in the bar magnet naturally but in solenoid the magnetism  is there so

long current flows through it.