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L5_6Apr_posted

# L5_6Apr_posted - Housekeeping HW1 is due today at 8pm HW2...

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Physics 6C: Gauss’s Law 2 Housekeeping HW1 is due today at 8pm HW2 is due Monday Homework sets are designed to take ~ 2 hours (based on MP’s averages) 3 Midterms Midterms will stay at the original dates… ! Friday 4/22 (material on HWs 1-3) ! Friday 5/13 (material on HWs 4-6) 4 Correction… An (infinitely) long line of charge has a cylindrically symmetric electric field… ! and has the form ! where ! is the linear charge density (in C/m) ++++++++++++++++++++++++++

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5 Dipole -- work and potential energy Left to itself a dipole in an electric field will align with the field… If the dipole starts aligned with field, a torque is needed turn it to angle " ! external torque does work on dipole ! potential energy of dipole increases If dipole starts at angle " and rotates freely ! field does work on dipole ! dipole potential energy transformed to kinetic energy " Wolfson formula takes " =90º as 0 potential energy point 6 Vector fields and field lines Electric field lines show direction of force on a positive test charge ! only one field line through any point » field lines never cross or intersect Field lines converge only when they ! originate from a positive charge ! or end on a negative charge Field lines are continuous… !
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