Creative Technology 9: Electric Charges
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Questions and Answers

What is electrostatics?

It is the study of electromagnetic phenomena that occur when there are no moving charges.

What is electrodynamics?

It is the study of the dynamics of electric charges and the electromagnetic forces that arise as a result.

What is the significance of Coulomb's law?

It describes the force between two charged objects.

What property of matter does electric charge describe?

<p>It is a basic property of matter carried by some elementary particles.</p> Signup and view all the answers

Like charges attract each other.

<p>False</p> Signup and view all the answers

What is the SI unit of electric charge?

<p>Coulomb</p> Signup and view all the answers

How is charge quantified?

<p>Charge can be written as q = ne, where n is any integer and e is the elementary charge.</p> Signup and view all the answers

How many electrons must be removed from an object to have a charge of 1 C?

<p>Approximately 6.242 x 10^18 electrons.</p> Signup and view all the answers

A comb rubbed with hair acquires a net charge of ______.

<p>-0.96 C</p> Signup and view all the answers

Which of the following will be positively charged when rubbed against each other?

<p>Human Hair</p> Signup and view all the answers

What happens when a body with an initial charge of 15 C loses 5 x 10^19 electrons?

<p>The final charge of the body is 14.99 C.</p> Signup and view all the answers

Study Notes

Types of Electricity

  • Static Electricity: Involves the buildup of electric charges at rest.
  • Current Electricity: Concerns the flow of electric charges in a circuit.

Electrostatics

  • Definition: Study of electromagnetic phenomena with stationary charges.
  • Key Contribution: William Gilbert expanded knowledge of static electricity and related material properties.

Electrodynamics

  • Definition: Study of electric charge in motion and the electromagnetic forces produced.

Historical Development of Electricity

  • Thales of Miletus: First recorded investigator of amber's electric properties.
  • William Gilbert: Identified various substances exhibiting static electricity; introduced the term "electric."
  • Benjamin Franklin (1752): Demonstrated the connection between lightning and electricity through the kite experiment.

Electric Charge

  • Basic Property: Fundamental characteristic of matter carried by certain elementary particles.
  • Types of Charges: Two types exist— like charges repel, while opposite charges attract.
  • Unit of Measurement: Electric charge is measured in Coulombs (C).

Quantization of Charge

  • Charge Expression: Any detectable charge can be expressed as q = ne, where e = 1.602 x 10^-19 C (elementary charge).
  • Conservation of Charge: Charge is conserved during transfer; electrons are not created or destroyed.

Practical Applications and Questions

  • To have a charge of 1 C, approximately 6.242 x 10^18 electrons must be removed from an object.
  • A comb rubbed on hair gaining a charge of -0.96 C indicates electron gain through contact.
  • For an initial charge of 15 C losing 5 x 10^19 electrons, calculate the final charge using the relationship between charge and electron count.

Triboelectric Series

  • Definition: A ranking of materials based on their propensity to gain or lose electrons when in contact.
  • Human Hair vs. Rubber: Human hair tends to become positively charged when rubbed against rubber.

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Description

This quiz covers basic concepts of electric charges, including static electricity and electrodynamics. Students will explore the definitions and principles behind these electromagnetic phenomena. Test your understanding of electricity and its various types in the context of Creative Technology 9.

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