What is a solenoid ? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate ?

A solenoid is a coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder.

Pattern of Magnetic Field Lines:

The magnetic field lines around a current-carrying solenoid are similar to those of a bar magnet. One end of the solenoid behaves as a magnetic north pole, while the other behaves as a south pole.

Indication of Field Lines Inside:

The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is uniform (the same at all points) inside the solenoid.

``diagram {"xrange": [12.8, 87.2], "yrange": [-64.8, -15.2], "polygons": [{"points": [[30.0, -40.0], [70.0, -40.0], [70.0, -60.0], [30.0, -60.0]]}], "lines": [{"from": [35.0, -45.0], "to": [65.0, -45.0], "label": "Parallel lines (Uniform Field)"}, {"from": [35.0, -50.0], "to": [65.0, -50.0], "label": ""}, {"from": [35.0, -55.0], "to": [65.0, -55.0], "label": ""}, {"from": [65, -45], "to": [80, -30], "label": "External Field Loop"}, {"from": [80, -30], "to": [50, -20], "label": ""}, {"from": [50, -20], "to": [20, -30], "label": ""}, {"from": [20, -30], "to": [35, -45], "label": ""}], "points": [{"x": 50.0, "y": -50.0, "label": "Solenoid Coil"}], "caption": "Magnetic Field of a Solenoid"} ``