Gr 10 Physical Sciences Ch 12: Conservation of charge

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Questions and Answers

What does the principle of conservation of charge state?

  • The total charge before and after an interaction is always different
  • Charge can be created or destroyed during physical processes
  • The net charge of an isolated system remains constant during any physical process (correct)
  • Charge is only transferred from one material to another

What is a characteristic of conductors?

  • Charge remains concentrated in one area
  • Electrons are bound tightly to the atoms
  • They are poor insulators
  • Electrons can move relatively freely (correct)

What happens to an excess charge placed on a conductor?

  • The charge is transferred to an insulator
  • The charge is destroyed
  • The charge remains concentrated where it was placed
  • The like charges repel each other and spread out uniformly over the surface (correct)

What is the main difference between conductors and insulators?

<p>Conductors allow electrons to move freely, while insulators do not (A)</p> Signup and view all the answers

What is the role of the electrostatic force in determining the arrangement of charge on a conductor?

<p>It repels like charges, causing them to spread out uniformly (A)</p> Signup and view all the answers

What is an example of an insulator?

<p>Plastic (A)</p> Signup and view all the answers

What happens to an excess charge placed on an insulator?

<p>The charge remains concentrated where it was placed (D)</p> Signup and view all the answers

What is the shape of a conductor that affects the arrangement of charge on its surface?

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

What happens to the charge on two identical conducting spheres when they come into contact?

<p>The total charge remains the same, and is shared equally between the two spheres. (A)</p> Signup and view all the answers

What is the purpose of a lightning rod on a building?

<p>To safely channel away excess charge and reduce the risk of a lightning strike. (D)</p> Signup and view all the answers

Why do sharp points on conductors cause charge to leak off?

<p>Because the points have a high concentration of charge. (A)</p> Signup and view all the answers

What happens to the charge on an insulator when it is brought into contact with a conductor?

<p>The charge remains on the insulator and does not move. (C)</p> Signup and view all the answers

Why do conductors with irregular shapes have a concentration of charge near the points?

<p>Because the points have a high curvature, resulting in a concentration of charge. (B)</p> Signup and view all the answers

What is the effect of the distribution of charge on conductors in practical applications?

<p>It allows for the collection of charge at sharp points, which can be utilized in applications like lightning rods. (B)</p> Signup and view all the answers

What is the fundamental principle behind the conservation of charge?

<p>The net charge of an isolated system remains constant. (B)</p> Signup and view all the answers

Which material allows electrons to move relatively freely?

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

What happens to excess charge on an insulator?

<p>It remains concentrated where it was placed. (D)</p> Signup and view all the answers

Why do like charges repel each other on the surface of a conductor?

<p>Due to the electrostatic force. (B)</p> Signup and view all the answers

What is the primary reason for the uniform distribution of charge on a spherical conductor?

<p>The electrostatic force between like charges. (D)</p> Signup and view all the answers

Which of the following is an example of a conductor?

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

What is the primary difference between the behavior of charge on conductors and insulators?

<p>Conductors allow electrons to move freely, while insulators do not. (A)</p> Signup and view all the answers

What is the net result of the electrostatic force between like charges on the surface of a conductor?

<p>The charges repel each other. (D)</p> Signup and view all the answers

What is the primary reason for the concentration of charge near the points of a conductor with an irregular shape?

<p>The curvature of the object is greatest at the points. (A)</p> Signup and view all the answers

When two identical conducting spheres come into contact, what is the final charge on each sphere?

<p>(Q_1 + Q_2)/2 (B)</p> Signup and view all the answers

What is the primary purpose of a lightning rod on a building?

<p>To channel away excess charge and reduce the risk of a lightning strike. (C)</p> Signup and view all the answers

Why do sharp points on conductors cause charge to leak off?

<p>Because the concentration of charge at the points is high. (A)</p> Signup and view all the answers

What is a significant implication of charge distribution on conductors in practical applications?

<p>The protection of buildings from lightning strikes. (D)</p> Signup and view all the answers

Why does the distribution of charge on conductors not occur in insulators?

<p>Because charge cannot move freely in insulators. (B)</p> Signup and view all the answers

What is the underlying reason for the uniform distribution of charge on a spherical conductor?

<p>The repulsive forces between like charges cause them to spread out uniformly over the surface. (A)</p> Signup and view all the answers

What happens to the net charge of an isolated system during a physical process?

<p>It remains constant. (B)</p> Signup and view all the answers

Why do electrons in conductors move relatively freely?

<p>Because they are weakly bound to the atoms. (A)</p> Signup and view all the answers

What is the primary reason for the concentration of charge near the points of a conductor with an irregular shape?

<p>The points have a higher curvature, which increases the electric field. (D)</p> Signup and view all the answers

What is the implication of the principle of conservation of charge on the interaction between two charged objects?

<p>The total charge before and after the interaction remains the same. (A)</p> Signup and view all the answers

What is the primary difference between the behavior of charge on conductors and insulators?

<p>Conductors allow electrons to move freely, while insulators do not. (D)</p> Signup and view all the answers

What is the role of the electrostatic force in determining the arrangement of charge on a conductor?

<p>It causes the charge to spread out uniformly over the surface. (C)</p> Signup and view all the answers

What is the behavior of excess charge on an insulator?

<p>It remains concentrated at a single point. (A)</p> Signup and view all the answers

What is the primary reason for the concentration of charge near the points of a conductor with an irregular shape?

<p>The curvature of the conductor is greatest at the points (B)</p> Signup and view all the answers

What happens to the charge on two identical conducting spheres when they are not in contact?

<p>The charge on each sphere remains the same (B)</p> Signup and view all the answers

Why do buildings often have a lightning rod on the roof?

<p>To reduce the risk of a lightning strike by safely channeling away excess charge (B)</p> Signup and view all the answers

What is the primary reason for the difference in the distribution of charge on conductors and insulators?

<p>The ability of charge to move freely in the material (C)</p> Signup and view all the answers

What is the equation for the final charge on each sphere when two identical conducting spheres come into contact?

<p>Q = (Q1 + Q2)/2 (C)</p> Signup and view all the answers

Why do sharp points on conductors cause charge to leak off?

<p>The concentration of charge is higher at the points (C)</p> Signup and view all the answers

What happens to the charge on a conductor when it is brought into contact with another identical conductor?

<p>The total charge is shared equally between the two conductors. (D)</p> Signup and view all the answers

Why do buildings often have a lightning rod on the roof?

<p>To safely channel away any excess charge that might accumulate, reducing the risk of a lightning strike. (C)</p> Signup and view all the answers

What is the significance of the concentration of charge near the points of a conductor with an irregular shape?

<p>It allows charge to leak off the conductor, reducing the risk of a lightning strike. (C)</p> Signup and view all the answers

Why does the distribution of charge on conductors not occur in insulators?

<p>Because charge cannot move freely in insulators. (C)</p> Signup and view all the answers

What is the equation for the final charge on each sphere when two identical conducting spheres come into contact?

<p>Q = (Q1 + Q2) / 2 (B)</p> Signup and view all the answers

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