PhysicsLAB Worksheet
Magnetic Forces on Moving Charges

Refer to the following information for the next two questions.

 
If the orange "diamond" particle shown above is negatively charged, in which direction is the magnetic force acting on it while it is at the position shown?




 
True or False? As the magnetic force acts on the particles shown in the diagram above, it does work on each one. This would be evidenced by a change in the kinetic energy of each particle.
 
Refer to the following information for the next two questions.

 
If the blue "plus sign" particle shown below is positively charged, in which direction will the magnetic force act on it while it is at the position shown?




 
If the green "square" particle shown above is positively charged, in which direction will the magnetic force act on it while it is at the position shown?




 
Refer to the following information for the next five questions.

A radioactive source gives off positively charged particles. Only specific particles having a predetermined "selected velocity" are permitted to travel through Region I into the Region II.
 
 
 
 
If the magnetic field (green shaded areas) is oriented in the same direction throughout the diagram, which way is it pointed?



 
Region I that is located between the parallel plates is called a velocity selector. What is the relationship between the particle's selected speed and the strengths of the crossed magnetic and electric fields? 

Given that the magnetic field is 2 T and the electric field is 10,000 V/m. If alpha particles are being released, having a charge of +|2e| and a mass of 6.65 x 10-27 kg, what is the radius of their circular orbit in the second region? 

If the radioactive source also gave off neutrons, in which direction would they travel in Region II?




 
If the radioactive source also gave off protons, how would the radius of their orbit in Region II compare to that of the alpha particles? Protons have a charge of +|e| and a mass of 1.67 x 10-27 kg. 





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