Examine the scenario.
A stream of positively-charged particles is moving to the left in a magnetic field. The particles experience an upward force.
Which choice most accurately describes the effect on the magnetic field on a stream of negatively-charged particles moving to the left?
a)A magnetic field influences the motion of charged particles. The negatively-charged particles will experience force acting against their motion, so the negatively-charged particles would slow down and stop moving.
b)A magnetic field does not influence the motion of negatively-charged particles. The particles would continue to move to the left.
c)A magnetic field influences the motion of charged particles. The negatively-charged particles will experience a force upward because positive and negative particles would experience a force in the same direction.
d)A magnetic field influences the motion of charged particles. The negatively-charged particles will experience a force downward because positive and negative particles would experience forces in opposite directions.
F = q * V cross B
If you reverse the sign of the charge q you reverse the direction of the force F.
d) A magnetic field influences the motion of charged particles. The negatively-charged particles will experience a force downward because positive and negative particles would experience forces in opposite directions.
To determine the effect of the magnetic field on a stream of negatively-charged particles moving to the left, we should consider the right-hand rule for magnetic fields. According to this rule, when a positively-charged particle moves in a magnetic field, it experiences a force that is perpendicular to both the velocity of the particle and the direction of the magnetic field. This force can be either upward or downward, depending on the specific situation.
In the given scenario, the positively-charged particles are experiencing an upward force in the magnetic field. Based on this, we can conclude that the magnetic field would influence the motion of negatively-charged particles as well. However, since negatively-charged particles have the opposite charge, they would experience a force in the opposite direction compared to positively-charged particles. Therefore, choice (d) is the most accurate description of the effect on the magnetic field on a stream of negatively-charged particles moving to the left. The negatively-charged particles would experience a force downward because positive and negative particles would experience forces in opposite directions.