Gr 9_Electric Charge & Electric Field

What is electric charge?

• Electric charge is a unit of currency

• Electric charge is a fundamental property of matter that can be positive or negative, and it is responsible for the electromagnetic force.

• Electric charge is a type of battery

• Electric charge is a type of magnetic field

Differentiate between insulators and conductors.

• Insulators do not conduct electricity well, whereas conductors conduct electricity well.

• Conductors do not conduct electricity well

• Insulators conduct electricity well

• Insulators are good conductors

Define electric field.

• Electric field is a scalar quantity that represents the charge density at a point in space.

• Electric field is a term used to describe the flow of electrons in a circuit.

• Electric field is a measure of the resistance of a material to the flow of electric current.

• Electric field is the region of space where an electric charge experiences a force due to other charges.

How does the presence of excess electrons affect an object's charge?

• It makes the object neutral.

• It gives the object a negative charge.

• It gives the object a positive charge.

• It has no effect on the object's charge.

Describe the process of charging by induction.

• Charging by induction is the process of transferring charge from one object to another through direct contact.

• Charging by induction involves the use of magnets to charge an object without contact.

• Charging by induction is the process of charging an object by rubbing it against a charged object.

• Charging by induction is the process of charging an object without direct contact by bringing a charged object close to a neutral object, causing charge separation.

Discuss the concept of static electricity.

• Static electricity is the same as dynamic electricity, just with a different name.

• Static electricity is the flow of current in a circuit caused by the movement of charged particles.

• Static electricity is the build-up of electric charge on the surface of objects caused by friction between materials, leading to the transfer of electrons.

• Static electricity is the result of magnetic fields interacting with conductive materials.

Why do insulators not conduct electricity easily?

• High conductivity

• Low resistance

• Tightly bound electrons

• Loosely bound electrons

Which diagram shows the electric field pattern and direction around a positive point charge?

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Two isolated metal spheres are both negatively charged. The spheres are brought close together but do not touch. Which diagram shows the charge distribution on the spheres?

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A plastic rod is rubbed with a dry woollen cloth. The rod becomes positively charged.

Which statement is correct?

• Electrons move from the cloth to the rod.

• Electrons move from the rod to the cloth.

• Protons move from the cloth to the rod.

• Protons move from the rod to the cloth.