A proton describes a circle of radius 1 cm in a magnetic field of strength 0.10 T. What would be the radius of the circle described by an a-particle moivng with the same speed in the same magnetic field?

Explanation

To solve the problem, we need to find the radius of the circle described by an alpha particle moving with the same speed in the same magnetic field as a proton.

### Step-by-Step Solution:

1. **Understand the formula for the radius in a magnetic field**:
The radius \( r \) of the circular path of a charged particle moving in a magnetic field is given by the formula:
\[
r = \frac{mv}{qB}
...