Electric Fields_PRACTICE EXAM

Electric Fields_PRACTICE EXAM - _ Assigned Seat Number Dr....

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____________________ Assigned Seat Number Dr. Gary Agin PH2200 0A Exam I Fall 2003 Serway, Chapters 23-26:2 Part I: Qualitative Write the letter of the correct answer on the answer sheet. NO PARTIAL CREDIT: SUBMIT ONE ANSWER ONLY. Note that in qualitative multiple-choice questions, sometimes one answer is clearly correct, while the others are clearly incorrect. However, with some questions you must choose the best or most complete answer. Note also that even though this section is qualitative, the formula sheet may prove useful for some questions. 20 questions at 3 points each = 50 % of test 1. Consider Coulomb's law for point charges. The statement that r r FF 12 21 =− is an example of which of the following facts? (a) Coulomb's law obeys the principle of superposition. (b) Coulomb's law obeys Newton's 3rd law of motion. (c) Coulomb's law is an inverse-square law. (d) Coulomb's law has a very large constant of proportionality. 2. Three identical charges, q , are placed at the corners of an equilateral triangle. A fourth charge, Q , is placed midway between two of the charges as shown. Is it possible to choose a value for the charge Q such that the force on it due to the three corner charges is zero ? (a) Yes, because it is centered between identical charges at points B and C . (b) No, because three force vectors can never add to zero. (c) No, because the forces on Q due to the charges at points B and C are in the same direction (d) No, because an additional charge would be needed to cancel the force on Q due to the charge at point A .
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3. The magnitude of the electric field at a point in space is equal to (a) the force that would be felt by a proton if placed at that point (b) the force that would be felt by a electron if placed at that point (c) the force that would be felt by a test charge if placed at that point (d) the force per unit charge at that point 4. All of the following are properties of electric field lines EXCEPT : (a) A tangent to a field line gives the direction of the field at that point. (b) The number of field lines per unit cross-sectional area is proportional to the magnitude of the field. (c) Field lines can cross only at right angles. (d) Field lines can never cross. 5. Suppose an electric field is constant in a certain region of space and directed upward as shown. An electron is fired to the right into the field. What is the direction of the force that the field exerts on the electron once it has entered the field?
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This note was uploaded on 01/20/2010 for the course PHYSC 09 taught by Professor Gevils during the Spring '10 term at Bellarmine.

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Electric Fields_PRACTICE EXAM - _ Assigned Seat Number Dr....

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