Final answer:
Yes, there is a magnetic field produced around a thin beam of moving alpha particles.
Step-by-step explanation:
Yes, there is a magnetic field produced around a thin beam of moving alpha particles. When charged particles such as alpha particles move through a magnetic field, they experience a force called the magnetic Lorentz force. This force causes the charged particles to follow a curved path, which indicates the presence of a magnetic field. The magnitude and direction of the magnetic force depend on the velocity of the alpha particles and the strength of the magnetic field.