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Lesson Outcomes for PHY407 TOPIC LESSON OUTCOMES 10.0: ELECTROSTATICS At the end of this topic, the student should be able to: 10.1 Coulomb’s law REMARKS a) Explain the concepts of electrons, protons, charged objects, charged up, gaining charge, losing charge, grounding and charge conservation . b) Describe the motion of point charges when placed Relate the motion to near another charged object. Newton’s 2nd law of motion and to the concept of c) Relate the motion of charges to a force and state motion. Coulomb’s Law. qq F k 1 22 where the r d) Explain, qualitatively, how the direction and the electric constant strength of this force changes with magnitude of 1 N k 9.0 10 9 2 2 the charges and the distance between the 40 C m charges. e) Draw a force diagram to a system of point 2 point charges along the x-axes, along the y-axes charges and obtain the direction and magnitude and 3 charges that forms a of the resultant force acting on a point charge due right-angled triangle. to the presence of other point charges. HOURS 4 2 TOPIC 10.2 Electric field LESSON OUTCOMES REMARKS a) State qualitative meaning of an electric field b) Write the electric field strength produced by a q E k 2 . Note also the point charge and explain qualitatively how the r field strength and direction changes when direction. measured at different places. c) Sketch the electric field lines produced by an Indicate the change of isolated point charge, by two positive or two strength (field intensity) by negative point charges, by a pair of positivevarying the length of the negative charge and for a point charge placed field lines. between a uniformly-charged parallel plates. d) Obtain numerically and show pictorially the Draw the field lines for a electric field strength and direction for a point system of 2 positive charge, for a system of two charges and for a charges, 2 negative system of three charges. charges and a pair of positive- negative charge. e) Explain the effect of the electric field on a positive Numerically determine the test charge placed at midpoint between a pair of field intensity on the right, positive or charges and a pair of positive-negative on the left and at charge. midpoints along the line of a pair of positive charges and a pair of positivenegative charge. qq F q0 E k 02 . r HOURS 2