A change q of mass m is moving with a velocity of V, at right angles to a uniform magnetic fiels B. Deduce the expression for the radius of the circular path it describes.

Explanation

To derive the expression for the radius of the circular path described by a charged particle moving perpendicular to a uniform magnetic field, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Forces Acting on the Charged Particle**:
- A charged particle with charge \( q \) and mass \( m \) is moving with a velocity \( V \) at right angles to a uniform magnetic field \( B \).
- The magnetic force acting on the charged particle is given by the Lorentz force equation:
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