you witness an experiment in which a beam of electrons is created in an almost-s

Question

you witness an experiment in which a beam of electrons is created in an almost-spherical glass tube with the air pumped out; because of collissions with HE atoms in the tube, the electrons appear a greenish-blue beam. The beam of the electrons is initially going down towards the floor. The experimentor manages to deflect the beam of electrons towards the east. how could he manage to do this? a.) He brings the S pole of the magnet close to the south side of the tube. b.) He brings the N pole of the magnet close to the south side of the tube c.) He brings the S pole of the magnet close to the west side of the tube d.) the experimentor cannot use a magnet to create this effect

Explanation / Answer

An electric charge only experiences a force in a magnetic field if it is moving. Either a positive or a negative charge could be either attracted or repelled from either a north or a south pole depending on how it was moving.

Electrons are not just charges but also have magnetic moments, that is, they are like tiny bar magnets. So, treating them as infinitesimally small, they will experience a torque in the magnetic field which will cause them to align with the field so that the N (S) pole of the electron will point toward the S (N) pole of the bar magnet.

so, the experimentor brings the S pole of the magnet close to the west side of the tube.

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