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Next we move the +Q and +4Q charges to be 3 times as far apart as they were: +Q 5. Now what is the magnitude of the force on the +40? (b) F/3 (a) F/9 (c) 4F/9 (d) 4F/3 (e) other 6. Which of the arrows is in the direction of the net force on charge B? -1 +1 +1 (e) none of these The picture below shows a centimeters to the left is another particle (labeled A) which has a net charge of -2 units. Choose the pair of force vectors (the arrows) that correctly compare the electri with the electric force on B (caused by A). 7. particle (abeled B) which has a net electric charge of +l unit. Several c force on A 2 units +1 unit force on B force on A
8. In the figure below, positive charges q2 and q3 exert on charge qi a net electric force that points along the +x axis. If a positive charge Q is added at (b.0), what now will happen to the force on qı? (All charges are fixed at their locations.) before aftery +Q q1 (b, 0) (a) No change in the size of the net force since Q is on the x-axis. (b) The size of the net force will change but not the direction (c) The net force will decrease and the direction may change because of the interaction between Q and the positive charges g2 and q The net force will increase and the direction may change because of the interaction between Q and the positive charges q2 and q3. (d) (e) Cannot determine without knowing the magnitude of qi and/or Q 9. In the figure below, the electric field at point P is directed upward along the y-axis. If a negative charge -Q is added at a point on the positive y-axis, what happens to the field at P? (All of the charges are fixed in position.) before -9 (a) Nothing since -Q is on the y-axis. (b) Strength will increase because -Q is negative. (c) Strength will decrease and direction may change because of the interactions between-Q and the two negative qs. Strength will increase and direction may change because of the interactions between -Q and the two negative qs Cannot determine without knowing the forces -Q exerts on the two negative qs (d) (e)
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Understanding the applications of Coulomb's Law

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