Electric Forces and Static Charge

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Questions and Answers

What charge does a glass rod acquire after being rubbed with a silk cloth?

Uncharged

Neutral

Negatively charged

Positively charged (correct)

What is the expected behavior when two identical polythene rods are brought close together?

They will attract each other

One will become neutral

They will repel each other (correct)

They will remain unchanged

What happens when a negatively charged polythene rod is brought near an uncharged rod?

They will repel each other

The uncharged rod will become positively charged

There will be no interaction

They will attract each other (correct)

Which of the following materials is classified as a conductor?

Copper Signup and view all the answers

What is the defining characteristic of a conductor?

It allows charge to flow easily through it Signup and view all the answers

If two rods are oppositely charged, what will be the interaction between them?

They will attract each other Signup and view all the answers

When rubbing a polythene rod with a woolen cloth, what charge does the rod acquire?

Negatively charged Signup and view all the answers

What indicates that two objects have the same charge?

The objects repel each other Signup and view all the answers

What happens to the electric force when two charges of the same type are brought closer together?

The force becomes stronger. Signup and view all the answers

Which statement correctly describes the interaction between two opposite charges?

They attract each other. Signup and view all the answers

What causes static charge to build up between two materials?

Transfer of electrons between the materials. Signup and view all the answers

Which materials are typically good conductors of heat due to free electrons?

Copper and gold Signup and view all the answers

What is the result of rubbing a plastic comb through hair?

Electrons are transferred to the comb. Signup and view all the answers

As the distance between two charged objects increases, what happens to the force between them?

It decreases. Signup and view all the answers

If a negative particle enters an electric field created by a positive charge, what will it feel?

A positive force pulling it closer. Signup and view all the answers

What is the relationship between the electric force and the strength of the field at a given point?

The force is proportional to the strength of the field. Signup and view all the answers

What direction do the electric field lines point around a positively charged conducting sphere?

Away from the sphere's center Signup and view all the answers

How are materials charged by friction?

By transferring electrons between materials Signup and view all the answers

What is the shape of electric field lines in a uniform electric field?

Straight parallel lines between plates Signup and view all the answers

What happens to a plastic rod when it is rubbed with a cloth?

It gains negative charge Signup and view all the answers

In a scenario with two charged spheres, what does the electric field pattern resemble?

Straight lines from positive to negative Signup and view all the answers

What occurs when insulating materials are rubbed against each other?

One material loses electrons and becomes positively charged Signup and view all the answers

Which of the following is an example of static electricity?

A Van de Graaff machine creating sparks Signup and view all the answers

What defines the behavior of charges on insulators after friction?

They remain in place and cannot flow away Signup and view all the answers

What charge does the object receive after electrons are transferred to it?

Negatively charged Signup and view all the answers

What happens to the object from which electrons leave?

It becomes positively charged Signup and view all the answers

Which statement accurately describes static electricity in terms of charge interaction?

Like charges repel while opposite charges attract Signup and view all the answers

How does charging by induction occur?

By bringing a charged object close without touching Signup and view all the answers

In which scenario would static electricity be considered dangerous?

During a lightning storm Signup and view all the answers

What is one application of static electricity in everyday life?

Photocopiers Signup and view all the answers

Which material is most likely to give up electrons when rubbed against another material?

Glass Signup and view all the answers

What effect does rubbing a plastic rod with a cloth have on their charges?

The rod becomes positively charged, the cloth negatively charged Signup and view all the answers

Which of the following materials is considered a better conductor of electricity?

Copper Signup and view all the answers

What characteristic of metals allows them to conduct electricity very well?

Presence of free charges Signup and view all the answers

What defines an insulator in terms of charge flow?

Materials that have no free charges Signup and view all the answers

In an electric field, field lines represent what aspect of the electric force?

Direction of force on a positive charge Signup and view all the answers

Which of the following statements about the strength of an electric field is true?

It is strongest close to the charged object. Signup and view all the answers

Which of the following materials can be classified as a better insulator?

Plastic Signup and view all the answers

Which factor does not affect the flow of charge in a conductor?

Color of the material Signup and view all the answers

Electrons in a conductor are described as:

Delocalized and free to move Signup and view all the answers

Study Notes

Electrostatic Charging

Glass rod rubbed with silk cloth: Acquires a positive charge.
Two identical polythene rods: Repel each other because they acquire the same charge (negative).
Negatively charged polythene rod near uncharged rod: Attracts the uncharged rod due to charge separation.
Conductor: Material allowing free movement of electric charge, like metals.
Defining characteristic of a conductor: The presence of free electrons which can move easily.
Oppositely charged rods: Attract each other.
Polythene rod rubbed with woolen cloth: Acquires a negative charge.
Two objects have the same charge: They repel each other.
Two charges of the same type brought closer: Electric force between them increases.
Interaction between opposite charges: They attract each other.
Static charge buildup: Caused by friction, transferring electrons between materials.
Good heat conductors: Materials with free electrons like metals.
Rubbing a plastic comb through hair: Comb gains a negative charge, hair becomes positively charged.
Increasing distance between charged objects: Electric force decreases.
Negative particle in electric field (positive charge): Experiences a force in the opposite direction of the field.
Relationship between electric force and field strength: Electric force is proportional to the strength of the electric field.
Electric field lines around a positively charged sphere: Radiate outwards from the sphere.

Materials and Charge

Charging by friction: Transfer of electrons between materials, creating static charge.
Shape of electric field lines in a uniform field: Parallel straight lines.
Plastic rod rubbed with cloth: Rod gains a static charge, either positive or negative, depending on the material of the cloth.
Electric field pattern between two charged spheres: Resembles lines joining the spheres.
Insulating materials rubbed together: Electrons transfer from one material to another, creating static charges.

Static Electricity

Example of static electricity: Lightning, sparks when touching metal objects, shocks from clothes.
Behavior of charges on insulators after friction: Charges remain localized on the surface of the insulator.
Object receiving electrons: Acquires a negative charge.
Object losing electrons: Acquires a positive charge.
Static electricity in terms of charge interaction: It involves the buildup and discharge of static charges.
Charging by induction: Process of redistributing charges within an object by bringing a charged object nearby.
Dangerous static electricity: Can happen during refuelling of aircraft due to friction, leading to explosions.
Application of static electricity: Photocopiers, electrostatic precipitators for air purification.
Material likely to give up electrons: Materials that are easily oxidized, like wool.

Conductors and Insulators

Rubbing a plastic rod with cloth: The plastic rod and cloth achieve opposite charges.
Better conductor of electricity: Metals, due to free electrons.
Characteristic of metals for good conduction: The presence of delocalized electrons that can move freely.
Insulator: Material that resists the flow of charge due to tightly bound electrons.
Electric field lines in an electric field: Represent the direction of force on a positive test charge placed in the field.
Strength of electric field: Is proportional to the number of field lines per unit area.
Better insulator: Materials like rubber, glass, and plastic.
Factors not affecting charge flow in a conductor: The shape of the conductor.
Electrons in a conductor: Are delocalized and move freely throughout the material.

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Description

This quiz explores the concepts of electric force, static charge, and charge detection. It covers the interactions between charged objects, the behavior of like and unlike charges, and the processes involved in charge buildup. Test your understanding of these fundamental principles of electricity.