Question

Basic source of magnetism

• A. Charged particles alone
• B. Movement of charged particles
• C. Magnetic dipoles
• D. Magnetic domains

Answer 1

The correct option is B

Movement of charged particles

The explanation of the correct option:

In the case of option ($\mathrm{B}$)

1. The primary source of magnetism is the movement of charged particles because, When the charged particles move along on a conductor or a circuit, a magnetic field is induced.
2. The particle has a charge q, and it moves in the direction of magnetic force.
3. The velocity of the particle experiences a perpendicular magnetic force.
4. The speed of the charged particle does not change in the magnetic field, but the velocity does change due to the change in the direction of motion of a charged particle.
5. The velocity to be v and represents the mathematical equation of this particle perpendicular to the magnetic field where the magnetic force acting on a charged particle of charge q is $\mathrm{F}=\mathrm{q}(\mathrm{v}\mathrm{x}\mathrm{B}).$
6. Here, the magnetic force becomes centripetal due to its direction towards the circular motion of the particle. Hence, if the field and velocity are perpendicular to each other, the particle takes a circular path.
7. Hence, option (B) is the correct answer.

The explanation for the incorrect options:

1. In the case of option ($\mathrm{A}$), magnetism is caused by the motion of electrically charged particles. The magnitude of the charge, the particle's velocity, and the magnetic field's strength all affect the force acting on an electrically charged particle in a magnetic field.
2. In the case of option ($\text{C}$), the magnitude signifies the magnetic orientation and strength of a magnet or other object that creates a magnetic field.
3. In the case of option ($\mathrm{D}$), a magnetic domain is a region of a magnetic substance where the magnetization is uniformly distributed.