A positive helium ion (He^+) is released from rest from the surface of a +1000 V

Question

A positive helium ion (He^+) is released from rest from the surface of a +1000 V electrode. It crosses (in vacuum) the 1 mm gap, passes through a small hole in a 0 V electrode and into a magnetic field, and then begins to curve. The magnetic field is uniform in the region to the right of the 0 V electrode and is zero to the left of the 0 V electrode. What is the direction of the magnetic field? Explain your reasoning and show the field on the diagram. The magnetic field strength is 1.0 T. Does the ion collide with the 0 V electrode? Explain.

Explanation / Answer

a) Since the ion moved upwards, F = q * vXB

Since q is positive vXB should be in the upward direction. So magnetic field is into the paper.

b) Since magnetic field strength is only on the rigth side of electrode, It wont curve till it reaches the outer edge of 0 V electrode. So it will never collide

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