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A physics exam from the university course phys-224, taught by dr. Russell during the summer 2007 semester. The exam covers chapters 25, 26, and 27, and includes multiple-choice questions related to electric fields, point charges, and gauss' law. Students are required to determine the nature of the forces between charged objects, find net electric fields, and calculate distances for various scenarios.
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Page 2 Test # 1 (chapters 25 , 26 , 27 ) PHYS- 224 Dr. Russell (Summer 2007 )
net electric field at point P as a vector using
vectors on the figure.
PHYS- 224 Dr. Russell (Summer 2007 ) Test # 1 (chapters 25 , 26 , 27 ) Page 3
density! = + 6. 8! 10
b. Use symmetry to determine whether the x or y components of the electric fields cancel. c. Write down an expression for the component of the electric field at point P due to a point charge segment dq in terms of dq , r , and an angle (but don’t try to combine them)
PHYS- 224 Dr. Russell (Summer 2007 ) Test # 1 (chapters 25 , 26 , 27 ) Page 5