Electricity Unit 7 Quiz
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Questions and Answers

What is the phenomenon associated with stationary or moving electric charges called?

  • Nuclear energy
  • Electromagnetism
  • Magnetism
  • Electricity (correct)

Which particle in an atom carries a positive charge?

  • Proton (correct)
  • Neutron
  • Ion
  • Electron

What occurs when moving electrons transfer between atoms?

  • Electromagnetic induction
  • Thermal energy generation
  • Electric charge production (correct)
  • Magnetization

When an object has equal positive and negative charges, it is described as:

<p>Electrically neutral (B)</p> Signup and view all the answers

What is the basic unit of matter that is composed of protons, neutrons, and electrons?

<p>Atom (D)</p> Signup and view all the answers

What is the origin of electric force according to the content?

<p>Presence of electric charge (B)</p> Signup and view all the answers

Which of the following types of charges exists in an atom?

<p>Positive and negative charge (C)</p> Signup and view all the answers

What drives the phenomenon associated with electromagnetism?

<p>Combination of electric and magnetic phenomena (C)</p> Signup and view all the answers

What occurs when two like charges are brought near each other?

<p>They repel each other. (C)</p> Signup and view all the answers

What is the fundamental principle regarding the conservation of electric charge?

<p>Electric charge is always conserved. (C)</p> Signup and view all the answers

Which of the following statements about the charge of a neutral atom is true?

<p>It has an equal number of positive and negative charges. (B)</p> Signup and view all the answers

According to Coulomb's law, the electric force between two charges is inversely proportional to which of the following?

<p>The square of the separation distance between the charges. (A)</p> Signup and view all the answers

What is the charge of a proton?

<p>+1e (A)</p> Signup and view all the answers

Which of the following best describes the nature of electric force?

<p>It is conservative and acts along the line joining the charges. (B)</p> Signup and view all the answers

According to Coulomb's law, what happens when two opposite charges are brought together?

<p>They attract each other. (C)</p> Signup and view all the answers

How is electric charge expressed mathematically?

<p>q = ne, where n is an integer. (B)</p> Signup and view all the answers

What is the SI unit of the electric field?

<p>Newton per Coulomb (N/C) (A)</p> Signup and view all the answers

What does Coulomb's law state about the force between two charges?

<p>It is directly proportional to the product of the charges. (B)</p> Signup and view all the answers

The direction of the electric field due to a positive charge is:

<p>Away from the charge (D)</p> Signup and view all the answers

If the distance between two charges is doubled, how does the force between them change?

<p>The force becomes one-fourth as large. (C)</p> Signup and view all the answers

Which statement about electric field lines is true?

<p>Closer spaced lines indicate a stronger field. (D)</p> Signup and view all the answers

What is the SI unit of the constant k in Coulomb's law?

<p>N m² C⁻² (C)</p> Signup and view all the answers

For a negatively charged particle in an electric field created by a positive charge, the force on the particle will be directed:

<p>Towards the positive charge (B)</p> Signup and view all the answers

In the presence of two opposite charges of equal magnitude, the electric field lines would:

<p>Start at the positive charge and terminate at the negative charge. (A)</p> Signup and view all the answers

What is the magnitude of the electrostatic force between charges q1=2 μC and q2=−3 μC separated by 0.5 m?

<p>72 N (C)</p> Signup and view all the answers

If the force between two charges is 20 N and the distance is halved, what will be the new force?

<p>80 N (C)</p> Signup and view all the answers

Which of the following best describes the relationship between charge magnitude and electric field strength?

<p>Electric field strength is directly proportional to the square of the charge. (D)</p> Signup and view all the answers

If the force between two charges is 36 N when they are 2 m apart, what will the force be if the distance is increased to 6 m?

<p>9 N (C)</p> Signup and view all the answers

For two similar charges of equal magnitude, the electric field lines would indicate:

<p>Lines emerging from both charges in opposing directions. (B)</p> Signup and view all the answers

When visualizing an electric field, which of the following is a correct statement?

<p>Electric fields can exist in a vacuum. (A)</p> Signup and view all the answers

Given charges q1=5 μC and q2=10 μC are experiencing a force of 90 N, what is the distance between the charges?

<p>0.2 m (C)</p> Signup and view all the answers

Which statement accurately describes an electric field?

<p>It exerts an electric force on another charged object within it. (A)</p> Signup and view all the answers

Flashcards

What is electricity?

A phenomenon resulting from stationary or moving electric charges.

What are electric charges?

Tiny particles that carry positive or negative electric charges and make up atoms.

What are the properties of electric charge?

A fundamental property of matter that exists in two forms: positive and negative.

What are positive and negative charges?

Protons are positively charged particles, while electrons are negatively charged particles.

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What is an electrically neutral object?

An object with an equal amount of positive and negative charges, resulting in no net charge.

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What is the electric force?

The force that exists between charged objects.

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What is Coulomb's Law?

A fundamental law describing the force between two point charges.

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How is Coulomb's Law formulated?

The force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

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Charged object

An object that has an imbalance of positive and negative charges.

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Electric force

The force of attraction or repulsion between two charged objects.

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Conservation of charge

A principle stating that electric charge cannot be created or destroyed, only transferred from one object to another.

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Elementary charge (e)

The smallest unit of electric charge. Its magnitude is 1.6 x 10^-19 Coulombs.

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Coulomb's Law

The force between two stationary charged particles.

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Coulomb's Law: Charge Magnitude

The force between two charged particles is proportional to the product of the magnitudes of the charges.

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Coulomb's Law: Distance

The force between two charged particles is inversely proportional to the square of the distance between them.

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Coulomb's Law: Newton's Third Law

When two charged objects interact, they exert equal and opposite forces on each other.

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Force vs. Distance

If the distance between two charges is doubled, the force between them becomes one-fourth as large.

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SI Unit of k

The SI unit of the constant k in Coulomb's law is N m² C⁻².

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Electric Field

Electric field is a region surrounding a charged object where another charged object would experience electric force.

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Direction of Electric Field

The direction of the electric field is defined as the direction of the force exerted on a small positive test charge placed at that location.

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Charged Object in Electric Field

A charged object placed in an electric field will experience an electric force.

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Electric Force and Field Strength

The electric force is proportional to the strength of the electric field and the magnitude of the charged object.

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Electric Field Lines

The electric field lines start at a positive charge and end at a negative charge. The density of the lines indicates the strength of the field.

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Electric Field of Similar Charges

The electric field of two similar charges (both positive or both negative) will repel each other, causing the field lines to diverge.

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Electric Field of Opposite Charges

The electric field of two opposite charges will attract each other, causing the field lines to converge.

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Electric Field Strength and Distance

The strength of the electric field is inversely proportional to the square of the distance from the charge.

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Electric Field: Vector and Unit

The electric field is a vector quantity, meaning it has both magnitude and direction. The SI unit of electric field is Newton per Coulomb (N/C).

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Electric Field Lines: Crossing

Electric field lines never cross each other.

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Study Notes

Unit 7: Electricity

  • Electricity is a phenomenon associated with stationary or moving electric charges
  • Many devices rely on electromagnetism (a combination of electric and magnetic phenomena)
  • The concept of electric force was recognized in ancient Greek times (around 700 BC)
  • Electricity is a fundamental concept in technology, including computers, television, telecommunications, and medical instruments
  • Electricity originates from the presence of electric charge.

Electric Charge

  • Electric charge arises from particles within atoms
  • Protons carry a positive charge (+ve).
  • Electrons carry a negative charge (-ve).
  • Neutrons are electrically neutral, carrying no net charge.
  • Atoms have an equal number of protons and electrons, hence electrically neutral
  • Moving electrons create electricity.

Properties of Electric Charge

  • Charges exist in two types: positive and negative.
  • Like charges repel and unlike charges attract.
  • Charged objects can attract or repel other charged objects
  • Electric charge is conserved, meaning it cannot be created or destroyed, only transferred from one object to another
  • Electric charge is quantized, meaning it comes in discrete packets (e.g., ±e) with e equaling (1.6 x 10-19 C).

The Electric Force: Coulomb's Law

  • Coulomb's Law describes the force between two stationary charged particles.
  • The electric force is inversely proportional to the square of the distance between the charges
  • The electric force is directly proportional to the product of the magnitudes of the charges.
  • Attractive force exists between oppositely charged particles while repulsive forces exist between similarly charged particles.

Mathematical Formulation of Coulomb's Law

  • Coulomb's Law is mathematically expressed as: Fe = k*(|q1|*|q2|)/r2.
  • k, the Coulomb constant, is approximately 9 × 109 N⋅m2/C2.

Electric Field

  • An electric field surrounds charged objects.
  • If another charged object enters a region containing an electric field, it experiences an electrical force.
  • Electric field direction is defined as the direction of the electrical force exerted on a small +ve test charge placed at that location.
  • Electric field lines originate from positive charges and terminate on negative charges.
  • The strength of an electric field is greater where field lines are closer together.

Electric Field due to a point charge

  • The electric field due to a point charge q at a distance r from the charge is given by E=k*(|q|)/r2
  • The direction of the electric field depends on whether the charge q is positive or negative, directed away from positive charge and towards a negative charge.

Electric Field Lines

  • Electric field lines are a useful visual representation of electric fields.
  • Field lines originate from positive charges and terminate on negative charges.
  • The density of field lines indicates the strength of the electric field.
  • Field lines never cross.

8 Questions on Coulomb's Law

  • (See the associated document for detailed questions and answers.)

6 Questions on Electric Field

  • (See the associated document for detailed questions and answers.)

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Unit 7 Electricity - Past Paper PDF

Description

Test your understanding of electricity and electric charge concepts in this quiz based on Unit 7. Explore the fundamentals of electric force, the characteristics of protons, electrons, and neutrons, and the properties of electric charges. Challenge yourself with questions that cover the basics and applications of electricity in technology.

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