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Coulomb's Law Practice problems: Show G-U-E-S-S in the space provided. k = 8.99 x 109 N·m2/C2 1. What is the electrostatic force between two metal spheres, each having 5 C of charge. The balloons are 0.30 m apart. 2.5 x 1012 N 2. Suppose that two point charges, each with a charge of +1 Coulomb are separated by a distance of 1 meter. (a) Will they attract or repel? (b) Determine the magnitude of the electrical force between them. 9 x 109 N 3. Two balloons are charged with an identical quantity and type of charge: -0.0025 C. They are held apart at a separation distance of 8 m. Determine the magnitude of the electrical force of repulsion between them. 878.9 N 4. Two charged boxes are 4 meters apart from each other. The blue box has a charge of +0.000337 C and is attracting the red box with a force of 626 Newtons. Determine charge of the red box. Remember to indicate if it is positive or negative. 0.0033 C 5. A piece of styrofoam has a charge of -0.004 C and is placed 3 m from a piece of salt with a charge of -0.003 C. How much electrostatic force is produced? 12,000 N 6. A helium nucleus has charge +2e and a neon nucleus +10e, where e = 1.60 x 10-19 coul. With what force do they repel each other when separated by 3 x 10-9 meters? 5.1 x 10-10 N 7. If two equal charges, each of 1 coulomb, were separated in air by a distance of 1 km, what would be the force between them? 9000 N repulsion 8. Determine the force between two free electrons spaced 1 angstrom (10-10 m) apart. 2.3 x 10-8 N repulsion 9. The force of repulsion between two argon nuclei is 7.4 x 10-8 N when separated by what distance. The charge on an argon nucleus is +18e. 1.004 x 10-9 m 10. Two equally charged pith balls are 3 cm apart in air and repel each other with a force of 4 x 10-5 N. Compute the charge on each ball. 2 x 10-9 C 11. Two small equal pith balls are 3 cm apart in air and carry charges of +3 x 10-9 and –12 x 10-9 C respectively. Compute the force of attraction. If the balls are touched and then separated by a distance of 3 cm, what will be the force between them? (hint: the charge of each pith ball will be the average of the two charges). a) 3.6 x 10 –4 N b) 2 x 10-4 N repulsion Electrical Notes 1. Like charges ___repel_____, opposites ____attract______. 2. Describe an insulator and give examples: Does not conduct heat and electricity very well. Cotton, air, glass, etc. 3. Describe a conductor and give examples: Allows heat and electricity to move through the substance easily. Metals, saltwater, etc. 4. Charge of an electron: -1.6 x 10-19C Charge of a proton: +1.6 x 10-19C Same number, opposite sign 5. What is Coulombs Law? (explain each letter) F=kqq/r2 F is force (N), k is Coulombs constant (8.99 x 109Nm2/C2), q is the charge (C), r is the distance between the charges (m). 6. Draw an electric field around a positive charge: 7. Draw an electric field around a negative charge: 8.