1.

Amagnetic field set up using Helmholtz coils (described in Exercise4.16) is uniform in a small region and has a magnitude of 0.75 T. Inthe same region, a uniform electrostatic field is maintained in adirection normal to the common axis of the coils. A narrow beam of(single species) charged particles all accelerated through 15 kVenters this region in a direction perpendicular to both the axis ofthe coils and the electrostatic field. If the beam remainsundeflected when the electrostatic field is 9.0 ×10−5V m−1,make a simple guess as to what the beam contains. Why is the answernot unique?

Answer»

A
magnetic field set up using Helmholtz coils (described in Exercise
4.16) is uniform in a small region and has a magnitude of 0.75 T. In
the same region, a uniform electrostatic field is maintained in a
direction normal to the common axis of the coils. A narrow beam of
(single species) charged particles all accelerated through 15 kV
enters this region in a direction perpendicular to both the axis of
the coils and the electrostatic field. If the beam remains
undeflected when the electrostatic field is 9.0 ×
10−5
V m−1,
make a simple guess as to what the beam contains. Why is the answer
not unique?


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