Key points to be remembered

Some key points to be remembered from Class 12 Physics Chapter Magnetic Field:

1. Magnetic field is a region in which a magnetic force is experienced by a magnetic material.
2. Magnetic field lines are imaginary lines used to represent the magnetic field.
3. Magnetic field lines always form closed loops, and the direction of the magnetic field is tangent to the field line at any given point.
4. The direction of the magnetic field at a point is defined as the direction in which a north-seeking compass needle would point if placed at that point.
5. Magnetic field strength is measured in units of tesla (T), gauss (G), or oersted (Oe).
6. The magnetic field due to a current-carrying conductor is given by Ampere's law.
7. The right-hand thumb rule can be used to determine the direction of the magnetic field around a current-carrying conductor.
8. The magnetic field due to a long straight wire, a circular loop, and a solenoid can be calculated using mathematical formulas.
9. The force experienced by a charged particle in a magnetic field is given by the Lorentz force equation.
10. A charged particle moving perpendicular to a magnetic field will experience circular motion with a radius given by the equation r = mv/qB, where r is the radius of the circle, m is the mass of the particle, v is the velocity of the particle, q is the charge of the particle, and B is the magnetic field strength.
11. The cyclotron is a device used to accelerate charged particles using a combination of magnetic and electric fields.
12. The magnetic field of the earth is responsible for the phenomenon of aurora borealis and aurora australis.