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A magnetic field set up using Helmholtz ...

A magnetic field set up using Helmholtz coils 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 xx 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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