Electric Fields (T)

• What should you be able to describe by the end of this video?

  How charged objects exert a force
• What is meant by an electric field?

  Region around a charged object affecting others
• What happens when an insulator gains electrons?

  It becomes negatively charged
• What happens when an insulator loses electrons?

  It becomes positively charged
• What is static electricity?

  Charge buildup on insulators
• What is the force between objects with opposite charges?

  Attraction
• What is the force between objects with the same charge?

  Repulsion
• What happens to hair when a person touches a Van de Graaff generator?

  Hair stands on end due to repulsion
• How do scientists explain forces between charged objects?

  Using the concept of electric fields
• What does an electric field around a charged object indicate?

  It can exert a force on other charges
• What happens when a positively charged object is brought near another positively charged object?

  They repel each other
• What do field lines represent in an electric field?

  Direction of force on a charge
• How must field lines be oriented relative to the surface of a charged object?

  Perpendicular at a 90-degree angle
• What does the direction of arrows on field lines indicate?

  Direction of force on a positive charge
• What happens to the force between charged objects as distance decreases?

  The force becomes stronger
• What type of questions will you find in the vision workbook related to this topic?

  Questions on forces between charged objects
• What are the key points about charged objects and forces?

  • Opposite charges attract
  • Same charges repel
  • Non-contact forces involved
• What is the concept of an electric field?

  • Surrounds charged objects
  • Exerts forces on other charges
  • Represented by field lines
• How does distance affect the force between charged objects?

  • Closer distance increases force
  • Further distance decreases force