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Lecture

# January 10.doc

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School
Department
Physics
Course
PHYS 102
Professor
Zaven Altounian
Semester
Winter

Description
Phys 102 Alanna Houston January 10, 2008 - Where is E = O when you have a positive and negative charge in line? o Same magnitude, opposite direction o Region 3 is to the left of the positive Q1, Region 2 is in between the charges, and Region 1 is to the right of the negative Q2 o Possible in regions three or one with the opposite direction condition o For the magnitude condition, we need to know the values of Q1 and Q2 o Region 3 would work if Q1Q2 - Falling object in the presence of air friction or drag. The drag force is proportional to the speed of the object - Fd = nv where n is the drag coefficient - As the object falls its speed and hence Fd increased. - After some time, Fd = mg - Net force on the object is zero and the object falls with constant speed, called terminal speed - v1 = mg/n - Charged objects, such as ions in solution, move in the presence of an electric field. - The electric force is opposed by the drag force. The drag coefficient n, is proportional to the size of the ion - For terminal speed: nvt = qE and Vt = qE/n - Unlike objects falling in gravitational fields, ions reach vt in a very short time. Ie ions travel at constant speed - Ions can be separated by size (electrophoresis) - Gel Electrophoresis: IF the ions pass through
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