TOPIC: Coulomb's Law

II. KEY CONCEPT Law of charge states that alike charges repel and unlike charges attract. We have seen that a force acts between two or more charged objects. A French scientist Charles-Augustin de Coulomb formulated Coulomb's Law. This law states that the electric force (attractive and repulsive) is directly proportional to the product of the two charges and inversely proportional to the square of distance between the two charges. In symbols F = k qiq2/R2 Where F is the magnitude of electrical force in newton (N) k is the electrostatic constant equivalent to 9.0 x 10 N.m2/C2 ql and q2 are the electric charges in coulomb (C ) R is the separation between two charges in meter (m) The direction of the electric force is dependent on the relative signs of the two charges. If the charges have unlike signs, they exert attractive force on each other and if the charges have like signs, they will exert repulsive force on each other. III. A.MATERIALS Pen and paper Calculator B. REFERENCES Padua, Alicia et. Al Practical and Explorational Physics Modular Approach , Vibal Publishing House Inc. pp.254-256 Heuvelen, Alan Van, Physics- A General Introduction, Second Edition, pp. 477-482 Beiser, Arthur Modern Technical Physics, Sixth Edition, Addison-Wesley Publishing Inc. pp.473-476www.physicsclassroom.com IV. PROCEDURE Using the Equation F= k q1 q2/R2, complete the table below. Show your solution. Electrostatic Electrostatic Charge (qi) Charge (q2) Distance Force ( F) in constant (k) in in coulumb in coulumb between two newton(N) N.m2/Cz (C) (C) charges (R2) in meter (m) 9.0 x 10 % N.m2/C2 3 x 10 - C 7 x 10 # C 6 x 10 -2m -7.0 x 10 -4 N 9.0 x 10 * N.m2/C2 4 x 10 & C -4.5 x 10 & C -1.0 x 102N 9.0 x 10 * N.m/C2 -3 x 10* C 0.040 m 65 N 9.0 x 10 * N.m?/C? - 6.0 x 10 -&C 0.050 m 9.0 x 10 # N.m?/C? -2.0 x 104 C 8.0 x 10 & C 0.30 m