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802x_05_sol8

# 802x_05_sol8 - 8.02x Problem Set 8 Solutions Problem 1(10...

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8.02x – Problem Set 8 Solutions Problem 1 (10 points) a) The currents run in the same direction ˆ x . The field created by the first wire has direction ˆ z at the place of the second wire. The electrons in the second wire move to ˆ x (opposite the current), so the Lorentz force on them has direction y ˆ, towards the first wire. The wires attract each other. b) Now the currents run in opposite directions. Replace the velocity of electrons in the second wire by vectorv , so we get force vector y direction). The F (in the ˆ wires thus repel each other. Problem 2 (10 points) The electrons in the CRT tube are deﬂected to the right, when looking from the front. This could be caused by an electric field pointing horizontally to the left, or a magnetic field pointing vertically upwards. Let’s try to distinguish these cases by moving the apparatus around. If we rotate the apparatus in the horizontal plane, and the beam is still deﬂected to the right the problem-causing field is a vertical

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802x_05_sol8 - 8.02x Problem Set 8 Solutions Problem 1(10...

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