1. Kristia Mae D. Echin

2. COULOMB’S LAW Helps you calculate the forces on any two electric charges.

3. Charles Augustus Coulomb in 1785

4. Mathematically, F e = Kq 1 q 2 r 2

5.  The sign of electric force determines whether the electric charges attract or repel. If F e is negative = charges attract If F e is positive = charges repel Each proton(+) or electron(-) only carries an absolute charge of 1.60 x 10 - 19 C.

6.  Suppose that two point charges, each with a charge of +1.00 Coulomb are separated by a distance of 1.00 meter. Determine the magnitude of the electrical force of repulsion between them. Given: Q 1 = 1.00 CQ 2 = 1.00 C d = 1.00 m Find: F e = ?

7. F e = k Q 1 Q 2 / d 2 F e = (9.0 x 10 9 Nm 2 /C 2 ) (1.00 C) (1.00 C) / (1.00 m) 2 F e = 9.0 x 10 9 N

8.  Two balloons are charged with an identical quantity and type of charge: -6.25 nC. They are held apart at a separation distance of 61.7 cm. Determine the magnitude of the electrical force of repulsion between them. Given: Q 1 = -6.25 nC = -6.25 x 10 -9 CQ 2 = -6.25 nC = -6.25 x 10 -9 C d = 61.7 cm = 0.617 m Find: F e = ?

9. F e = k Q 1 Q 2 / d 2 F e = (9.0 x 10 9 Nm 2 /C 2 ) (6.25 x 10 -9 C) (6.25 x 10 -9 C) / (0.617 m) 2 F e = 9.23 x 10 -7 N

10. M-DISCOVERY

11. Lodestones rocks that could attract iron objects Magnesia region where lodestones are found Magnet most common way of introducing the nature of magnetism.

13.  To produce two different masses, two different electric charges and two different magnetic poles:  MASSES D

14.  ELECTRIC CHARGES Take neutrally charge object Separate charges Divide object into two pieces and separate the charge by distance D

15.  MAGNETIC FORCES Same scheme but will not work since magnetic poles refuse to be separated.

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