Fa08_7C_8

# Fa08_7C_8 - Physics 7C Fa 2008 Lecture 8 Electricity...

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Physics 7C Fa 2008 Lecture 8: Electricity & Magnetism Light as EM wave Polarizers

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2 Field Model of Magnetism A source moving charge creates a magnetic fields in a direction given by RHR1. Another moving charge, placed in a magnetic field, experiences a magnetic force Magnitude given by F=qvBsin θ Direction of force given by RHR2 θ F v B
3 Which direction is the magnetic field at the following points? Where is it biggest? 1) Left 2) Right 3) Up 4) Down 5) Into screen 6) Out of screen 7) Away from wire 8) Toward wire 9) Something else I A B C D Answers added as slides at end of lecture.

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4 Which direction is the magnetic field at the following points? Where is it biggest? 1) Left 2) Right 3) Up 4) Down 5) Into screen 6) Out of screen 7) Away from wire 8) Toward wire 9) Something else I W X Z Y Answers added as slides at end of lecture.
5 Which direction is the magnetic field at point C? 1) Left 2) Right 3) Up 4) Down 5) Into screen 6) Out of screen 7) Away from wire 8) Toward wire 9) Something else I 1 C I 2 You may assume I 1 = I 2

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6 Magnetic Force Suppose a large magnetic field points downward at every point in the room. What direction is the force on a positive particle traveling along the chalkboards , to your left? 1) Into the board 2) Out of the board 3) Left (along particle path) 4) Right (opposite path) 5) Down 6) Up 7) No Force θ v B F = qvBsin θ, where θ is the angle between B and v
7 Magnetic Force Suppose a large magnetic field points downward at every point in the room. What direction is the force on a positive particle traveling out of the board , to the back of the room?

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Fa08_7C_8 - Physics 7C Fa 2008 Lecture 8 Electricity...

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