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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 x× 10^(-5 )V m^(-1) , make a simple guess as to what the beam contains. Why is the answer not unique? |
| Answer» Solution :Deuterium ions or deuterons, the ANSWER is not UNIQUE because only the ratio ofcharge to mass is determined. Other possible ANSWERS are `He^(++) , Li^(+++) `, etc | |