coloms law

Student will ba able to :

lesson Objectives :

1-relate the electric force ,F on an Object that has a charge of q1

to the presense of another object that has a charge of q2 when
the objects are separated by distance r in the form of equation :

where K is the coulomb’s constant
recall that eqation is known as coulmb’s
law.

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what is the reason of this phenomenon?

Open Ended

answer

Discussion

SIMULATION ON colomb’s low

https://phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-

law_all.html

•

The law states that the magnitude, or absolute value, of the
attractive or repulsive electrostatic force between two point
charges is directly proportional to the product of the
magnitudes of their charges and inversely proportional to the
squared distance between them

Multiple Choice

As two oppositely charged particles approach each other, what happens to the electrical force between them?

• The attractive force increases

• The magnitude of the electric force decreases

• The repulsive force increases

• The magnitude of their charges increases

Open Ended

coloms law state that

Example Problem:
The force between two identical charges separated by
1 cm is equal to 90 N. What is the magnitude of the
two charges?

Example :

First

• Define the variables:
• F = 90 N
• q1 = charge of first body
• q2 = charge of second body
• r = 1 cm
.Use the Coulomb’s Law equation
Coulomb Force equation

q1=q2

Multiple Choice

Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 9 ·10⁹

Quizez

Plenary

HW