Electromagnetism

1. What is the purpose of a Bubble chamber? What is it used for? 
2. Some chemistry: The simplified diagram on the upper right shows that the particles enter thechamber from the left hand side. The chamber is filled with liquid hydrogen and/or helium. Justbefore the particles enter the chamber, the piston (labelled) is lowered. What happens to thepressure of the liquid? 
 
3. After the piston is lowered, the liquid is said to be superheated. This means that it is right at thepoint where it would boil with any additional input of energy. Discuss how this state allows us tocreate "bubbles" or "trails" when the particles enter the liquid. 
 
4. The coils in the diagram represent a cross-section of a solenoid that surrounds the liquid. Onceturned on, this solenoid (coils) generates a magnetic field (B-field) directed upwards as shown.DIRECTLY on the diagram (upper left). Using the right hand rule, label the directions of thecurrents on both the right and left side coils shown. 
 
5. If we look at the chamber of liquid from the top, we will see the particles entering create curvedor spiral paths as shown below: 
a. From this view the magnetic field created by the solenoid will be out of the page. Label this external B-field with an array of vectors directly onto the image above. 
b. Using your right hand rule, identify at least one positive particle trail, and one negative charge trial. Label these two choices clearly onto the above diagram.12 



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