Electroscopes Particle picturesCharge 100 200 400 300 500 100 200 300 400 500

electroscopesParticle pictures Charge

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Particle Pictures for 100

• What is the charge on this object? How do you know?

Solution

Particle Pictures for 100 Solution

The object has more electrons than protons so it is negatively charged

What are 3 things we know about this object?

Solution

• Neutral• Insulator• Polarized

Please draw the mystery object on the left, it has 6 atoms in it.

Solution

Mystery Object

Is a conductor

9 Electrons

• Mystery object is a conductor• It must be positively charged for the neutral

object to be attracted to it

Please draw these particle pictures

Solution

3 electrons, insulator9 electrons, conductor

FAR APART

FAR APART AFTER CONTACT

Objects in their initial positions

Please draw these particle pictures

Solution

4 electrons, conductor

FAR APART

Objects in their initial positions, they are CONDUCTORS

16 electrons, conductor

10 electrons 10 electrons

Charge for 1001) What types of objects can transfer their charge by contact?2) What types of objects can NOT transfer their charge by contact?

Solution

Charge for 100 Solution

1) Conductors – electrons move easily in and out of their atoms

2) Insulators – electrons do NOT easily move in and out of their atoms

Charge for 200

What are the 3 particles that make up an atom and what are their respective charges?

Solution

Protons – Positive chargeElectrons – Negative chargeNeutrons – No charge

Charge for 300

What Charge could the mystery object have?

Solution

Neutral O

bjectMystery Object

The electrons in the Neutral Object are attracted to the mystery object, therefore the mystery object must be positively charged.

Neutral O

Charge for 400

What charge could the mystery object have?

Solution

Positi

Mystery Object

The mystery object could be negative or neutral as the electrons in the positively charged balloon are being repelled by the electrons in the mystery object

Or Neutral

Positi

Charge for 500

Please draw the mystery object with 8 atoms.Is there more than one correct answer? explain

Solution

Mystery object

Is an insulator NEAR

Neutral Positive

Electroscopes for 100Solution

FACT - This electroscope is Neutral

Why is the needle/straw of this electroscope rotated? What is the term we use to describe this electroscope?

Positively Charged Object, near but not in

contact

Electroscopes for 100 Solution• The electrons move up

to the top of the electroscope leaving the bottom positively charged, so the needle rotates

• We say this electroscope is polarized

Positively Charged Object, near but not in

contact

Electroscopes for 200

What two things do we know about this electroscope?

Solution

Electroscopes for 200 Solution

• The electroscope is Neutral because the needle is not rotated

• It is also not polarized

What do we know about the charged object?What do we know about the mystery object?Do these objects have anything in common?

Solution

A charged object is placed on top of the electroscope and is moved

FAR AWAY.

A mystery object is then BROUGHT NEAR the electroscope and the result

is shown below.

1. The charged object is a conductor2. The mystery object is charged opposite of the charged object.3. We can not determine the material of the mystery object

because it has not contacted the electroscope

A charged object is placed on top of the electroscope and is moved

FAR AWAY.

A mystery object is then BROUGHT NEAR the electroscope and the

result is shown below.

Solution

A charged object is placed on top of the electroscope and is moved FAR

A mystery object is then IN CONTACT with the electroscope and

the result is shown below.

What do we know about the charged object?What do we know about the mystery object?Do these objects have anything in common?

A charged object is placed on top of the electroscope and is moved FAR

A mystery object is then IN CONTACT with the electroscope and

the result is shown below.

1. The charged object is a conductor2. The mystery object is charged the same as the charged object3. We can not determine the material of the mystery object

because it is still in contact with the electroscope

Solution

All objects are FAR

A positively charged

object is in contact

All objects are

FAR AWAY AGAIN

A mystery object is

in CONTACT

All objects are

FAR AWAY AGAIN

1. What type of object was the positively charged object?2. What TWO things do we know about the mystery object?3. Explain your answers!

Electroscopes for 500 Solutions

All objects are FAR

A positively charged

object is in contact

All objects are

FAR AWAY AGAIN

A mystery object is

in CONTACT

All objects are

FAR AWAY AGAIN

1. The positively charged object is a conductor because it transfers its charge to the electroscope

2. The mystery object is positively charged and an insulator because the electroscope indicated an increased SAME charge and it did not transfer its charge to the electroscope

Electroscopes Particle picturesCharge 100 200 400 300 500 100 200 300 400 500

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