Chapter 20 The space between two charged metal plates is filled with a uniform e

Question

Chapter 20

The space between two charged metal plates is filled with a uniform electric field as shown below. A beam of ions enters the device as shown. The plates are part of a velocity selector used to allow only those particles, from the ion beam, that enter the device with a specific velocity to pass through undeflected. A uniform magnetic field is also needed. undefected particles ion beam Assume that the ions are positively charged. In which direction does the magnetic field need to be directed for the device to work? Would your answer be different if the ions were negatively charged? Explain your reasoning. Draw a free-body diagram (showing the electric and magnetic forces only) for a positively charged ion that passes undeflected through the device. Repeat for a negatively charged ion. Clearly label each force. Uniform fields E and B , chosen so that ions with a velocity Vs pass through the selector undeflected, are maintained in the region between the plates. Sketch the trajectory and free body diagram for a positively charged ion that enters the device with a speed that exceeds Vs (= |Vs|)- The lengths of the force arrows in the free body diagram should reflect the relative magnitudes of the forces. Repeat for a negatively charged ion with the same speed. Briefly explain your reasoning in each case.

Explanation / Answer

a) out of the page

b) for negative charged particle magnetic filed should be in to the page.

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