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# practiceexam1solns - EXAM 1 Dr Edward Rhoads IUPUI Physics...

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EXAM 1 IUPUI Physics 219 Dr. Edward Rhoads Summer 2008 Note: some tests were slightly different than this one and therefore had slightly different answers. Part I – Multiple Choice Conceptual Questions 1) Two charged objects attract each other with an electric force F . Suppose that the distance between them is doubled. The new electric force equals (A) 2 F (B) ½ F (C) 4 F (D) 1/8 F (E) 1/4 F Force is proportional to 1/r 2 2) A higher Capacitance tells you that: (A) you collecting charge more efficiently (B) you can collect less charge (C) you are collecting charge less efficiently (D) you are using a dielectric with a lower dielectric constant (E) none of the above 3) Electric field lines ALWAYS (A) point toward decreasing values of potential. (B) point in the same direction as the electric force. (this one is violated by negative charges) (C) are parallel to equipotential surfaces. (D) start on negative charges and end on positive charges. (this one is untrue if there is not a positive or a negative charge) (E) point directly to a charge. 4) A proton, released at rest in an electric field (with an assortment of charges), ALWAYS moves: happens if there is either no electron or a large charge that is only slightly further away…

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