A velocity selector is a device that is used in association with a mass spectrometer. The velocity selector contains an electric field and a magnetic field at right angles to each other. Suppose the electric field points in the +y direction and the magnetic field points in the +z direction as shown in the diagram. The electric field strength is 500 N/C.

A positively charged particle is then shot into the region, traveling in the +x direction with velocity of 4000 m/s. If the particle is to pass through the velocity selector along a straight path, what must be the magnitude of the magnetic field? 

 

Refer to the previous problem. If the particle were negatively charged, what trajectory would it follow?

a. it would pass through the velocity selector along a straight-line path

b. It would be deflected toward the +y axis

c. It would be deflected toward the -y axis

d. It would be deflected toward the +z axis

e. It would be deflected toward the -z axis

 

Refer to the previous diagram. Suppose the positively-charged particle is travelling at a higher speed while E and B remain unchanged. What trajectory would it follow?

a. it would pass through the velocity selector along a straight-line path

b. it would be deflected toward the +y axis

c. it would be deflected toward the -y axis

d. it would be deflected toward the +z axis

e. it would be deflected toward the -z axis

 

• 1497666100-fig B E v axes.png

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