A proton and a deutron having equal momenta enter in a region of uniform magnetic field at right angles to the direction of the field. Depict their trajectories in the field.

Explanation

To solve the problem of the trajectories of a proton and a deuteron entering a uniform magnetic field at right angles, we can follow these steps:

### Step 1: Understand the Given Information
We have a proton and a deuteron with equal momenta entering a uniform magnetic field perpendicularly.

### Step 2: Identify the Relevant Formula
The radius \( r \) of the circular path of a charged particle moving in a magnetic field is given by the formula:
\[
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