phys1bl lab2

# phys1bl lab2 - Physics 1BL Introduction Coulombs Law and...

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Physics 1BL Coulomb’s Law and Superposition Spring 2009 1 The two balls before charging 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) 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 = 10.0 cm apart from each other and rigidly held in place. A third ball with a charge of 3.0 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 +5.0 μ C charge. 2) Three charges are arranged in a square (along with point P) with sides equal to 8.0 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 0.35 μ C charge placed at point P. +4.0 μ C 5.0 μ C 8.0 cm Figure 1 P +3.0 μ C 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 same sign charge to the right ball? (e.g., Q on the left and 2Q on the right).

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Physics 1BL Coulomb’s Law and Superposition Spring 2009 2 A3. Draw a force diagram for the left ball in situation A2. A4. Write an expression for the electrostatic force and the charge on the left ball. A5. Look at each variable in your expression for charge. Which quantities can be measured with the equipment at hand? Which quantities cannot be measured? Can you express the quantities that cannot be measured in terms of measurable quantities? A6.
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phys1bl lab2 - Physics 1BL Introduction Coulombs Law and...

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