An electron does not suffer any deflection while passing through a region of uniform magnetic field. What is the direction of the magnetic field ?

Explanation

To solve the problem of why an electron does not suffer any deflection while passing through a region of uniform magnetic field, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Motion of the Electron**: An electron is a charged particle that moves with a certain velocity. When it enters a magnetic field, it experiences a magnetic force if it is moving perpendicular to the direction of the magnetic field.

2. **Magnetic Force on a Charged Particle**: The magnetic force \( \mathbf{F} \) acting on a charged particle moving in a magnetic field is given by the equation:
\[
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