A positively-charged ion travelling at 250 m sis fired between two parallel charged plates, M and N. There is also a magnetic field present in the region between the two plates. The direction of the magnetic field is into the page as shown. The ion is travelling perpendicular to both the electric and the magnetic fields. M X X X X X X X X N The electric field between the plates has a magnitude of 200 V m¹. The magnetic field is adjusted so that the ion passes through undeflected. What is the magnitude of the adjusted magnetic field, and the polarity of the M terminal relative to the N terminal? Magnitude of magnetic field Polarity of M relative to N (teslas) 0.8 positive 0.8 negative 1.25 positive 1.25 negative B. C. D.

A positively-charged ion travelling at 250 m sis fired between two parallel charged plates, M and N. There is also a magnetic field present in the region between the two plates. The direction of the magnetic field is into the page as shown. The ion is travelling perpendicular to both the electric and the magnetic fields. M X X X X X X X X N The electric field between the plates has a magnitude of 200 V m¹. The magnetic field is adjusted so that the ion passes through undeflected. What is the magnitude of the adjusted magnetic field, and the polarity of the M terminal relative to the N terminal? Magnitude of magnetic field Polarity of M relative to N (teslas) 0.8 positive 0.8 negative 1.25 positive 1.25 negative B. C. D.