Quiz6 Jun-2009

# Quiz6 Jun-2009 - Quiz 6 DL Name(last Rubric Codes...

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Quiz 6 DL # Name (last) (first) |___|___|___ Rubric Codes : Student ID: ____________________ first 3 letters last name I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature ANSWERS WITHOUT WORK WILL RECEIVE NO CREDIT. MARK YOUR ANSWERS CLEARLY. You can use a CALCULATOR 2 C 2 C A B P 4C -2C 10 cm 6 cm a) Two charges are on a line as shown in the figure. What is the net ‘electric field’ at point P? Draw the electric field vectors at point P. Electric force constant . 92 91 0 . / kN m b) What is the ‘electric potential’ at point P? c) You bring a charge of “-1 C” from infinity to point P. What is the potential energy of that charge? d) What is the force on the “-1C” charge at point P? m E=kQ/r 2 F=q E V=kQ/r PE=q V

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Solution and Rubric Solution: A B P 4C -2C 10 cm 6 cm a) E=k(-2)/(0.06) 2 +k(4)/(0.16) 2 = -3.59x10 12 N/C. The net electric field is pointing to the left as shown with the red arrow. b) V= k(-2)/(0.06)+k(4)/(0.16) = -7.2x10 10 V c) PE = q V= (-1) (-7.2x10 10 )= 7.2x10 10 J d) F=qE = (-1) (-3.59x10 12 ) = 3.59x10 12 N. The force is pointing to the right.
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Quiz6 Jun-2009 - Quiz 6 DL Name(last Rubric Codes...

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