List two methods of producing magnetic fields.
Two methods of producing magnetic fields are:
1. Using a permanent magnet: A bar magnet produces a magnetic field around it. The magnetic field lines emerge from the north pole and merge at the south pole, forming a pattern around the magnet.
2. Using current-carrying conductors: When electric current flows through a conductor such as a straight wire, circular loop, or solenoid, it produces a magnetic field. The magnetic field produced by a current-carrying wire depends directly on the current passing through it. In a circular coil having n turns, the field produced is n times as large as that produced by a single turn.
Explanation
The textbook context mentions drawing magnetic field lines around a bar magnet, indicating that permanent magnets produce magnetic fields. Additionally, the context discusses 'Magnetic Field due to a Current through a Circular Loop' and 'Magnetic Field due to a Current in a Solenoid', explicitly stating that 'the magnetic field produced by a current-carrying wire at a given point depends directly on the current passing through it.' These are the two primary methods of producing magnetic fields covered in the NCERT Class 10 Science curriculum.