Ch. 9 L1 Electric Charge

How does an object become positively charged?

• Gains electrons

• Gains protons

• Loses electrons

• Loses protons

Answer explanation

An object becomes positively charged by losing electrons. Electrons carry a negative charge, so when they are removed, the object has more protons than electrons, resulting in a net positive charge.

Charging an object by wiping electrons on to it.

• Insulation

• Conduction

• Friction

• Induction

Answer explanation

Charging an object by wiping electrons onto it occurs through friction. When two materials are rubbed together, electrons transfer from one to the other, resulting in a charge. Thus, the correct answer is Friction.

The loss of an unbalanced electric charge is called a(n) __________________ .

• static charge

• electric discharge

• negative charge

• grounding

Answer explanation

The loss of an unbalanced electric charge occurs when excess charge is released, which is known as electric discharge. This process can happen through various means, such as sparks or grounding, but the term specifically refers to the discharge itself.

The two factors that determine the strength of the electric force between two charged
objects are the distance and the ___________ of the objects.

• color

• size

• temperature

• amount of charge

Answer explanation

The strength of the electric force between two charged objects is determined by the distance between them and the amount of charge on each object. More charge results in a stronger force, making 'amount of charge' the correct answer.

Tags

NGSS.MS-PS2-3

How does an object become negatively charged?

• Loses protons

• Gains electrons

• Loses electrons

• Gains protons

Answer explanation

An object becomes negatively charged by gaining electrons. Electrons carry a negative charge, so when an object acquires more electrons than protons, it results in an overall negative charge.

Which particle is positively charged?

• electrons

• protons

• neutrons

• atoms

Answer explanation

Protons are positively charged particles found in the nucleus of an atom. In contrast, electrons are negatively charged, and neutrons have no charge. Therefore, the correct answer is protons.

Which material is a good electrical conductor?

• aluminum

• rubber

• paper

• glass

Answer explanation

Aluminum is a good electrical conductor due to its high conductivity and low resistance. In contrast, rubber, paper, and glass are insulators, meaning they do not conduct electricity well.

The process of charging an object without touching it.

• induction

• grounding

• conduction

• friction

Answer explanation

Induction is the process of charging an object without direct contact. It involves the influence of a charged object on a neutral object, causing a redistribution of charges, which is why induction is the correct answer.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A charged object has a(n) _________________, which applies an electric force on other charged objects.

• electric field

• neutral charge

• magnetic field

• polarization

Answer explanation

A charged object generates an electric field, which exerts a force on other charged objects. This field is responsible for the interaction between charges, making 'electric field' the correct choice.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Objects can be charged when electrons move from one object to another by direct contact.

• Friction

• Discharge

• Induction

• Conduction

Answer explanation

The correct answer is Conduction, as it refers to the process where electrons move between objects through direct contact, allowing them to become charged.