CBSE · Class 10 · Science · Magnetic Effects of Electric CurrentWhat is a solenoid? Draw a schematic diagram of magnetic field lines around a current-carrying solenoid and state how it behaves like a bar magnet.

A solenoid is defined as a coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder. Magnetic Field and Behavior: When an electric current is passed through the solenoid, it produces a magnetic field pattern that is very similar to the magnetic field of a bar magnet. One end of the solenoid behaves as a magnetic north pole, while the other end behaves as a south pole. The field lines inside the solenoid are parallel straight lines, indicating that the magnetic field is uniform at all points inside. By placing a soft iron core inside the solenoid, an electromagnet is formed. The strength of the magnetic field produced by a current-carrying solenoid depends directly on the magnitude of the current flowing through it, the total number of turns per unit length, and the nature of the core material placed inside it. This makes the solenoid an extremely useful component in electrical and electronic devices for generating controllable and uniform magnetic fields.