Lesson #25

Lesson #25
E.Q: What is the Coulomb's law about?

By Mr Correa

A very large unit of electrical charge​

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These charges hold atoms together​

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Charles-Augustin de Coulomb

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Distance of charges affect on ​electrostatic force

q₁= 1st objects charge

q₂= 2nd objects charge

r = distance

k ​= 9.00 * 10⁹ Nm²/C²

Coulomb's Law

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Multiple Choice

If q₁ was doubled what would be the effect on the Force?

• Doubled

• Quadrupled

• Half

• 1/4

​Charges can be either positive or negative.

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Multiple Choice

If r was doubled what would be the effect on the Force?

• Doubled

• Quadrupled

• Half

• 1/4

Energy is equal to Voltage times the charge ​

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Electrical Energy Relationship

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Multiple Choice

According to Coulomb's Law, when the distance increases, the electrostatic force ____________.

• increases

• decreases

• remains unchanged

• has no relationship to distance

Multiple Choice

The Coulomb is the unit for:

• Charge

• Force

• Distance

• Mass

Multiple Choice

What happens to the force between two charged objects when you double the distance between them?

• it doubles

• it is cut in half

• it quadruples

• it is cut by 1/4

Multiple Choice

If one of the charges doubles, what happens to the force?

• it doubles

• it gets cut in half

• it quadruples

• it is cut by 1/4

Multiple Choice

What is the unit for electrostatic charge?

• Coulombs

• Newtons

• Meters

• Joules

Multiple Choice

Coulomb’s law states that the force between two charged objects will __________ when the magnitude (value) of the object’s charge increases.

• increase

• decrease

• stay the same

• first increase, then decrease

Multiple Choice

What would a negative value for F_e mean?

• The particles are moving away from each other

• The particles have the same charge

• The particles have opposite charges

• The particles are moving towards each other

Multiple Select

Select all answer that apply:

What kinds of particles do Coulomb's Law apply to?

• electrons

• protons

• neutrons

• neutral atoms

Multiple Choice

A repulsive force exists between which two particles?

• Two neutrons

• An electron and a neutron

• An electron and a proton

• Two protons

Multiple Choice

The variable "r" in Coulomb's Law would have what units?

• Joules

• Coulombs

• Newtons

• Meters

Multiple Choice

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

• k_e = 9·10^-9

• k_e = 9.8

• k_e = 6.67·10^-11

• k_e = 9 ·10⁹

Multiple Choice

What does "r" measure?

• the distance between the two charged objects

• the amount of charge carried by the objects

• the amount of force between two charged objects

• the constant value for forces between the objects

Multiple Choice

What does F_e stand for?

• the electrostatic force

• the symbol for iron

• the constant for the charges

• the charges of the particles

Multiple Choice

What will be the units of F (or F_e)?

• Newtons

• Meters

• Coulombs

• Joules

Multiple Choice

As the value of r increases, what happens to the value of F?

• F increases

• F decreases

• F never changes, q does

• Cannot know from the information

Multiple Choice

What does q measure?

• the distance between the two charged objects

• the amount of charge carried by the object

• the amount of force between two charged objects

Multiple Choice

Why are there two q's in the equation?

• because there are two charged objects

• because there are protons and electrons

• because the particles are moving away from each other

• because the particles are moving towards each other

Multiple Choice

What can you do to increase the value of k?

• change the force

• change the distance

• change the charge

• nothing can be done to change the value of k; it is a constant

Multiple Choice

An attractive force exists between which two particles?

• Two neutrons

• An electron and a neutron

• An electron and a proton

• Two electrons

Multiple Choice

Coulomb's Law is __________ proportional.

• directly

• inversely

• polymetrically

• exponentially