electrostatics & coulomb's law

• Electrostatics is?


  The study of static electric charges.
• True or false; insulators can conduct electricity well.

  False
• True or false; conductors can conduct electricity well.

  True
• Do electrons move?

  Yes
• Do protons move?

  No
• Electrons are negative charges.
• Protons are positive charges.
• According to the law of conservation of charge, energy cannot be created nor destroyed
• Like charges repel, unlike charges attract.
• Insulators are charged by friction.
• Conductors are charged by induction.
• What is K in Coulomb's law?

  Coulomb's constant
• 9x10^9 Nm^2/C^2 is Coulomb's constant
• What direction are the electric field lines around an electron?

  Inward
• What direction are the electric field lines around a proton?

  Outward
• When the amount of protons and electrons are balanced, the atom/object is in neutral state.
• An atom that is electrically charged is called an ion.
• When a glass rod is rubbed with silk; the glass becomes positively charged and the silk becomes negatively charged.
• When an ebonite rod is rubbed with fur; the fur becomes positively charged and the ebonite becomes negatively charged.
• When a perspex rod is rubbed with wool; the perspex rod becomes positively charged and the wool becomes negatively charged.
• When a rubber balloon is rubbed with hair; the hair becomes positively charged and the rubber becomes negatively charged.
• When a polythene rod is rubbed with wool; the wool becomes positively charged and the polythene becomes negatively charged.