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**1. Five equal-mass particles (A–E) enter a region of uniform magnetic field directed into the page. They follow the trajectories illustrated in the figure.**

Rank from largest to smallest velocity

Rank from largest to smallest velocity

**2. qvBsin(theta) = ma**

qvB = ma = m(v^2/r)

v = qBr/m

qvB = ma = m(v^2/r)

v = qBr/m

**3. Based on their radii, it should be A > B > C=E**

But what about D? It is neutral, so has no radius because it doesn't go in a circle, but clearly has a velocity despite r = 0. Is the answer indeterminate, then?

But what about D? It is neutral, so has no radius because it doesn't go in a circle, but clearly has a velocity despite r = 0. Is the answer indeterminate, then?