Triboelectric Effect Quiz

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Questions and Answers

What factor contributes to an increase in the magnitude of static charge?

  • Constant pressure
  • Material composition (correct)
  • High humidity
  • Increased temperature

According to Coulomb's Law, what happens to the force of repulsion if the distance between two similarly charged bodies is tripled?

  • It decreases to 1/3 of the original value
  • It remains the same
  • It decreases to 1/9 of the original value (correct)
  • It increases by 9 times

Which of the following best describes the relationship stated in Coulomb's Law?

  • Force is directly proportional to the distance between charges
  • Force is independent of the charges
  • Force is inversely proportional to the product of the charges
  • Force is directly proportional to the product of the charges (correct)

What is the unit of electric charge as defined in the content?

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

How does humidity affect static charge generation?

<p>Lower humidity increases static charge (D)</p> Signup and view all the answers

What happens to the force of attraction or repulsion between two charged bodies if both charges are doubled?

<p>It becomes 4 times the original value (A)</p> Signup and view all the answers

If two electrically charged bodies have a charge of +2C and +3C and are separated by a distance of 1 meter, what will happen if the separation is increased to 2 meters?

<p>The force will be 1/4 of the original value (B)</p> Signup and view all the answers

What are the two key factors that determine the force acting between two charged bodies as per Coulomb's law?

<p>Charge magnitude and distance (B)</p> Signup and view all the answers

What is the primary reason that excess charge accumulates at points on a metal conductor?

<p>Curvature causes charge to spread out unevenly. (B)</p> Signup and view all the answers

Which of the following describes the process of charging a neutral object using a negatively charged rod?

<p>Electrons are transferred from the rod to the neutral object. (C)</p> Signup and view all the answers

What is the equivalent charge of one Coulomb in terms of electrons?

<p>6.24 x 10^18 electrons (A)</p> Signup and view all the answers

Why does a charged comb attract neutral bits of paper?

<p>The charged comb polarizes neutral molecules in the paper. (D)</p> Signup and view all the answers

In which material do excess charges primarily accumulate on the surface?

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

What method is commonly used to dissipate unwanted charges from aircraft during flight?

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

What happens to a neutral ball when it comes in contact with a negatively charged rod?

<p>Electrons from the rod move onto the ball. (C)</p> Signup and view all the answers

How does the charge distribution differ between conductors and insulators?

<p>Charges in conductors accumulate on the surface, while insulators retain charge throughout the material. (B)</p> Signup and view all the answers

What is typically true about the charge of matter?

<p>Matter typically has a neutral charge. (B)</p> Signup and view all the answers

What occurs when there are more electrons than protons in an atom?

<p>The atom becomes negatively charged. (A)</p> Signup and view all the answers

Which of the following describes the relationship established by Coulomb's Law?

<p>Force of attraction is directly proportional to the product of charges involved. (A)</p> Signup and view all the answers

How is static electricity primarily distributed?

<p>Concentrated at points or edges. (A)</p> Signup and view all the answers

What unit is used to quantify electric charge?

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

What is the result of electrostatic attraction?

<p>Opposite charges attract each other. (A)</p> Signup and view all the answers

Which statement about electrostatic repulsion is correct?

<p>It occurs between charges of the same type. (B)</p> Signup and view all the answers

Which particles in an atom carry a positive charge?

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

Flashcards

Triboelectric Effect

Charge magnitude influenced by material, force, separation rate, and humidity.

Coulomb’s Law

The relationship between electrical forces, charges, and distance.

Coulomb’s Law Examples

Doubling distance reduces force to one-fourth; doubling charges quadruples force.

1 Coulomb

Approximately 6.24 x 10^18 electrons

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Atom Composition

Atoms consist of a positively charged nucleus and negatively charged electrons

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Charge Transfer

Transfer of negative charges can occur when materials are rubbed together.

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Electrostatic Attraction

Charged objects can attract neutral objects by inducing charge redistribution.

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Charge on Conductors

Charges accumulate on the surface and move freely.

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Charge on Insulators

Charges are fixed and cannot easily move.

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Charge at Sharp Points

Charges tend to accumulate at sharp points on irregular metal shapes.

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What is Matter?

Matter that occupies space and has mass; can be solid, liquid, or gas.

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What are Elements?

Simplest form of matter, consisting of one type of atom

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Protons

Positively charged particles in the nucleus of an atom.

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Neutrons

Neutral particles in the nucleus of an atom.

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Electrons

Negatively charged particles orbiting the nucleus of an atom.

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Neutral Charge

Having an equal number of protons and electrons.

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Negative Charge

More electrons than protons.

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Positive Charge

Fewer electrons than protons.

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Study Notes

Triboelectric Effect

  • Static charge magnitude influenced by material composition, applied forces, separation rate, and relative humidity.
  • Lower humidity leads to higher static charge generation, particularly evident in winter and dry climates.

Coulomb’s Law of Charges

  • Describes the interaction between charged bodies as either attraction or repulsion.
  • Formulated by Charles A. Coulomb, stipulating that:
    • Force is directly proportional to the product of individual charges.
    • Force is inversely proportional to the square of the distance between charges.
  • Key variables:
    • Charges denoted as q1 and q2.
    • Distance between charges represented as d.

Coulomb’s Law Examples

  • Doubling the distance reduces repulsion force to one-fourth of the original.
  • Doubling the charges increases repulsion force to four times the original value.

Unit of Electric Charge

  • Electric charge unit is the Coulomb (C).
  • 1 Coulomb equals approximately 6.24 x 10^18 electrons.

Static Build-Up

  • Atoms consist of a positively charged nucleus and negatively charged electrons.
  • Rubber can scrape electrons off fur, resulting in a transfer of negative charges.

Electrostatic Attraction and Repulsion

  • A charged rod attracts a neutral ball, transferring some negative charges onto the ball, making both negatively charged and leading to repulsion.
  • Charged comb demonstrates attraction to neutral paper bits and water molecules.

Distribution of Electrostatic Charges

  • Charges on conductors, insulators, and metal points behave differently:
    • Metal balls accumulate charge on their surface.
    • Charge on insulators remains fixed and cannot easily move.
    • Irregular metal shapes lead to charge accumulation at sharp points.
  • Charge distribution concepts apply to phenomena like lightning and static discharge in aircraft.

Dissipation of Accumulated Charges

  • Charges tend to accumulate at points; aircraft utilize discharge wicks to release excess charges during flight.

Introduction to Static Electricity

  • Learning objectives include understanding static electricity, electrostatic charge distribution, laws of attraction and repulsion, units of charge, and conduction in various states of matter.

Matter and Elements

  • Matter occupies space and has mass, existing in solid, liquid, and gaseous states.
  • Elements consist of a single type of atom and cannot be reduced chemically.

Atom Structure

  • Atoms are the smallest units of elements, containing:
    • Protons (positively charged)
    • Neutrons (neutral)
    • Electrons (negatively charged)

Static Electricity Characteristics

  • Typically, matter possesses a neutral charge, maintaining an equal number of protons and electrons.
  • Imbalance:
    • Excess electrons lead to a negative charge.
    • Deficiency of electrons results in a positive charge.

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