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Name: A#: Lab# 1: - Understanding Coulomb Force Link https:/phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-law_en.html Objectives: Relate the electrostatic force magnitude to the charges and the distance between them . Determine the direction of force acting on one charge due to the other charge. Determine what makes a force attractive or repulsive Equipment: As available in simulation Theory: Coulomb Law: The magnitude of the electrostatic force of attraction or repulsion between two-point charges, qi and q2, is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance r between them. The force is along the straight line joining them. F = k 41 92 p where ke is the Coulomb constant and its value is ke - 8.9825 x 10" N.m?/C?. Coulomb constant is expressed as Ke = where so is the free space permittivity and its value is co - 8.85 x 10 12 C2/N.m2. F12 - -F21 - F12 F21 - F12- -F21 It may be noticed that like charges repel and unlike charges attract each other. Procedure: Open the simulation. 2. You have two possibilities: (1) macro scale in which the charges are in uC (microcoulomb) range and (2) atomic scale in which charges are multiple of electronic charges (e -1.60 x 10 "C). You can experiment with either one or both. 3. Considering macroscale, the charges are represented as spheres. The center of the sphere, shown as black dot, represents its position. 4. Keeping a charge at a fixed position, the separation between them can be varied by moving the other charge. 9 D &5. Magnitude of charges can be varied using the slider. 6. For different values of the distances and charges, calculate the force. 7. Compare your calculated value with the expected value by clicking on Force value. Coulomb's Law PHET: Charge 1 Charge 2 Force Values 10 pim O Coulomb's Law PHET: Data: Write the charges with their signs Charge Charge Distance r Calculated Direction Force Direction q.(C) q2(C) Force (N) value 2 OMProblems: 1. Calculate the Coulomb force between an electron and a proton which are separated by 5.3 x 10-9m. 2. Two-point charges of +0.5pC and +1.OuC, separated by 0.5m in vacuum, lie on a line. Where should a point charge q (+0.8 C) be placed on the line, other than at infinity, such that it experiences zero net force? Is this a stable or unstable equilibrium? OMO EK 7 9 O3. Three-point charges qi(4.0HC), q2(2.0uC) and qu( 1.OuC) are placed in vacuum as shown in the figure. The diameter of the circle is 20.0cm. Calculate the force experienced by charge q2 due to charges q, and q3. Express it in vector notation. 11 300 OM Do 8 9 O