Deflection of an Electron in a Magnetic Field

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Questions 1. How do your values for the magnetic field compare with the Earth’s magnetic field? 2. Why does the spot vanish when the accelerating voltage is too low? Hint: Look back at the equations (5) and (9) -- this should suggest two possibilities. Discuss both possibilities. 3. Why was it important to take measurements foe the current flowing in the positive and negative direction? 4. It was assumed that the ends of the coil made negligible contributions to the magnetic field. Is this true? Justify your argument. 42
Initiative Possible ideas: 1. Examine the structure of the magnetic field created by a wire, or a coil of wire. Does the magnetic field resemble what you have seen in your text and in class? 2. Carefully observe the deflections, which occur when you rotate the tube in the horizontal plane (with the coil off and the tube and its holder out of the coil frame, v free to rotate on the table). Remembering that F = q( v " B v ), what qualitative statements can you make about the magnetic field in the room? ! 43
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Page 5 and 6: Figure 3 As before, all of the volt
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Page 9: Obviously, we would like to compare

Deflection of an Electron in a Magnetic Field

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