W101BLLab02 - Physics 1BL Introduction Coulombs Law and...

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Physics 1BL Coulomb’s Law and Superposition Winter 2010 1 Introduction In this lab you will work on the ideas of Coulomb’s Law, electric field, and the superposition of Coulomb forces. You will explore how the electrostatic force between charges depends on distance, and demonstrate the ideas of superposition with multiple charges. Finally, you can check your skills with Electric Field Hockey. __________________________________________________________________________ Pre-lab Activity: Read Serway & Faughn 15.3, 15.4 & 15.8 1) A Van de Graaff generator is charged so that the electric field exerted at its top surface is 1.2 x 10 6 N/C directed upwards. Find (a) the electric force exerted on a Styrofoam peanut ( q = +0.25 μ C) released at its surface, (b) the gravitational force on the peanut, and (c) its net acceleration. (assume g = 10 m/s 2 ; m peanut = 0.75 grams). 2) Two charged balls, one with a charge of +5.0 μ C and the other with a charge of +2.4 μ C, are placed a distance d = 15.0 cm apart from each other and rigidly held in place. A third ball with a charge of + 2.0 μ C is dangled from a string between the two charged balls such that it remains in equilibrium. Calculate the distance the third charged ball is from to the +2.4 μ C charge. 3) Three charges are arranged in a square (along with point P) with sides equal to 2.0 cm as in Figure 1. Calculate the electric field (magnitude and direction) at point P due to the three charges. Next, calculate the force (magnitude and direction) on a + 0.50 μ C charge placed at point P. +4.0 μ C 5.0 μ C 2.0 cm Figure 1 P +3.0 μ C
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Physics 1BL Coulomb’s Law and Superposition Winter 2010 2 The two balls before charging LAB WORK: A: Group Activity In this white board activity, imagine that you are given two non-conducting balls, of equal masses, each attached to an insulating string. You also have a scale to measure weight, a ruler, and a charging mechanism. A1. The balls hang vertically side by side, as shown, when they are not charged. Predict and sketch what happens when you charge both balls equally (charges are equal in both magnitude and sign). Assume that the excess charge is distributed uniformly over each ball’s surface. A2. Sketch what happens if you give a double dose of the
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W101BLLab02 - Physics 1BL Introduction Coulombs Law and...

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