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Presentation9.notebook January 29, 2013 Four point charges are at the corners of a square of side a as shown in the figure. Determine the magnitude and direction of the resultant electric force on q, with ke, q and a in symbolic form. Presentation9.notebook Induction January 29, 2013 Presentation9.notebook January 29, 2013 Electric Field o Presentation9.notebook January 29, 2013 2 A test charge of +3μC is at a point P where the electric field due to other charges is directed to the right and has a manitude of 4 x 106 N/C. If the test charge is replaced with a charge of -3μC, the electric field at P has the same magnitude as before, but changes direction B increases in magnitude and changes direction C remains the same D decreases in magnitude and changes direction A 3 A circular ring of charge with a radius of "b" has a total charge q uniformly distributed around it. Find the magnitude of the electric field in the center of the ring. A B C D E 0 keq/b2 keq2/b2 keq2/b none of the above Presentation9.notebook January 29, 2013 Each of the protons in a particle beam has a kinetic energy of 3.25 x 10-15 J. What are the magnitude and direction of the electric field that will stop these protons in a distance of 1.25 m? mp=1.67 x 10-27 kg qp=1.60 x 10-19 C Presentation9.notebook January 29, 2013 Electric Field Electric Field +q -2q Presentation9.notebook January 29, 2013 Electric Field Lines Electric Field & Electric Field Vector